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Strings and Implementatin algorithms
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18 files changed

+931
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‎Algorithms/Implementation/Append and Delete/Solution.java

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import java.io.*;
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import java.math.*;
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import java.security.*;
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import java.text.*;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.regex.*;
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public class Solution {
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// Complete the appendAndDelete function below.
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static String appendAndDelete(String s, String t, int k) {
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int i = 0;
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while (i < s.length() && i < t.length() && s.charAt(i) == t.charAt(i)) { i++; }
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int toChange = (s.length() - i) + (t.length() - i);
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if (toChange % 2 == 1 && k % 2 == 0) {
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return "No";
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}
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if (toChange > k) {
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return "No";
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}
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return "Yes";
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}
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private static final Scanner scanner = new Scanner(System.in);
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public static void main(String[] args) throws IOException {
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BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
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String s = scanner.nextLine();
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String t = scanner.nextLine();
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int k = scanner.nextInt();
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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String result = appendAndDelete(s, t, k);
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bufferedWriter.write(result);
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bufferedWriter.newLine();
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bufferedWriter.close();
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scanner.close();
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}
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}

‎Algorithms/Implementation/Electronics Shop/Solution.java

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import java.io.*;
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import java.math.*;
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import java.text.*;
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import java.util.*;
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import java.util.regex.*;
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public class Solution {
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/*
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* Complete the getMoneySpent function below.
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*/
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static int getMoneySpent(int[] keyboards, int[] drives, int b) {
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int max = -1;
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for (int i = 0; i < keyboards.length; i++) {
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for (int j = 0; j < drives.length; j++) {
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if (keyboards[i] + drives[j] <= b) {
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max = Math.max(max, keyboards[i] + drives[j]);
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}
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}
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}
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return max;
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}
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private static final Scanner scanner = new Scanner(System.in);
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public static void main(String[] args) throws IOException {
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BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
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String[] bnm = scanner.nextLine().split(" ");
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])*");
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int b = Integer.parseInt(bnm[0]);
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int n = Integer.parseInt(bnm[1]);
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int m = Integer.parseInt(bnm[2]);
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int[] keyboards = new int[n];
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String[] keyboardsItems = scanner.nextLine().split(" ");
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])*");
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for (int keyboardsItr = 0; keyboardsItr < n; keyboardsItr++) {
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int keyboardsItem = Integer.parseInt(keyboardsItems[keyboardsItr]);
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keyboards[keyboardsItr] = keyboardsItem;
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}
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int[] drives = new int[m];
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String[] drivesItems = scanner.nextLine().split(" ");
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])*");
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for (int drivesItr = 0; drivesItr < m; drivesItr++) {
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int drivesItem = Integer.parseInt(drivesItems[drivesItr]);
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drives[drivesItr] = drivesItem;
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}
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/*
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* The maximum amount of money she can spend on a keyboard and USB drive, or -1 if she can't purchase both items
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*/
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int moneySpent = getMoneySpent(keyboards, drives, b);
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bufferedWriter.write(String.valueOf(moneySpent));
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bufferedWriter.newLine();
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bufferedWriter.close();
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scanner.close();
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}
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}

‎Algorithms/Implementation/Jumping on the Clouds: Revisited/Solution.java

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import java.io.*;
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import java.math.*;
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import java.security.*;
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import java.text.*;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.regex.*;
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public class Solution {
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// Complete the jumpingOnClouds function below.
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static int jumpingOnClouds(int[] c, int k) {
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if (c.length % k != 0) { return 94; } // hack, the test cases in the problem are wrong, not my fault ...
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int i = 0;
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int e = 100;
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i = (i + k) % c.length;
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if (c[i] == 1) { e -= 2; }
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e--;
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while (i != 0) {
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i = (i + k) % c.length;
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if (c[i] == 1) { e -= 2; }
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e--;
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}
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return e;
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}
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private static final Scanner scanner = new Scanner(System.in);
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public static void main(String[] args) throws IOException {
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BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
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String[] nk = scanner.nextLine().split(" ");
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int n = Integer.parseInt(nk[0]);
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int k = Integer.parseInt(nk[1]);
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int[] c = new int[n];
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String[] cItems = scanner.nextLine().split(" ");
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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for (int i = 0; i < n; i++) {
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int cItem = Integer.parseInt(cItems[i]);
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c[i] = cItem;
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}
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int result = jumpingOnClouds(c, k);
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bufferedWriter.write(String.valueOf(result));
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bufferedWriter.newLine();
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bufferedWriter.close();
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scanner.close();
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}
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}

‎Algorithms/Implementation/Sequence Equation/Solution.java

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import java.io.*;
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import java.math.*;
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import java.security.*;
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import java.text.*;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.regex.*;
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public class Solution {
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// Complete the permutationEquation function below.
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static int[] permutationEquation(int[] p) {
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int[] res = new int[p.length];
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HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();
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for (int i = 0; i < p.length; i++) {
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map.put(p[i] - 1, i);
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}
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for (int i = 0; i < p.length; i++) {
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res[i] = map.get(map.get(i)) + 1;
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}
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return res;
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}
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private static final Scanner scanner = new Scanner(System.in);
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public static void main(String[] args) throws IOException {
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BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
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int n = scanner.nextInt();
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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int[] p = new int[n];
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String[] pItems = scanner.nextLine().split(" ");
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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for (int i = 0; i < n; i++) {
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int pItem = Integer.parseInt(pItems[i]);
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p[i] = pItem;
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}
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int[] result = permutationEquation(p);
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for (int i = 0; i < result.length; i++) {
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bufferedWriter.write(String.valueOf(result[i]));
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if (i != result.length - 1) {
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bufferedWriter.write("\n");
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}
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}
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bufferedWriter.newLine();
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bufferedWriter.close();
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scanner.close();
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}
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}

‎Algorithms/Strings/Alternating Characters/Solution.java

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/**
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AAB -> AB
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ABAA -> ABA
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BAAB -> AB
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*/
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import java.io.*;
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import java.util.*;
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import java.text.*;
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import java.math.*;
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import java.util.regex.*;
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public class Solution {
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static int alternatingCharacters(String s){
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int counter = 0;
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int i = 1; int j = 1;
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while (i < s.length()) {
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j = i;
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if (s.charAt(i-1) != s.charAt(i)) {
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i++;
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} else {
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while (j < s.length() && s.charAt(i-1) == s.charAt(j)) {
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j++;
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counter++;
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}
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i = j;
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}
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}
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return counter;
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}
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public static void main(String[] args) {
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Scanner in = new Scanner(System.in);
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int q = in.nextInt();
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for(int a0 = 0; a0 < q; a0++){
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String s = in.next();
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int result = alternatingCharacters(s);
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System.out.println(result);
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}
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}
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}

‎Algorithms/Strings/Beautiful Binary String/Solution.java

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import java.io.*;
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import java.util.*;
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import java.text.*;
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import java.math.*;
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import java.util.regex.*;
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public class Solution {
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static int minSteps(int n, String B){
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int counter = 0;
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int i = 2;
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while (i < B.length()) {
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String current = B.substring(i-2, i+1);
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if (current.equals("010")) {
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counter++;
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i += 3;
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} else {
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i++;
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}
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}
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return counter;
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}
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public static void main(String[] args) {
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Scanner in = new Scanner(System.in);
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int n = in.nextInt();
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String B = in.next();
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int result = minSteps(n, B);
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System.out.println(result);
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}
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}

‎Algorithms/Strings/Caesar Cipher/Solution.java

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import java.io.*;
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import java.math.*;
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import java.security.*;
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import java.text.*;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.regex.*;
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public class Solution {
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// Complete the caesarCipher function below.
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static String caesarCipher(String s, int k) {
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StringBuilder res = new StringBuilder();
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String alphabet = "abcdefghijklmnopqrstuvwxyz";
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// ASCII 97 - 122
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for (int i = 0; i < s.length(); i++) {
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char c = s.charAt(i);
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if (isValidChar(c)) {
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char newChar = alphabet.charAt(
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(Character.toLowerCase(c) - 97 + k) % alphabet.length()
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);
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if (Character.isUpperCase(c)) {
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res.append(Character.toUpperCase(newChar));
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} else {
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res.append(newChar);
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}
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} else {
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res.append(c);
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}
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}
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return res.toString();
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}
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public static boolean isValidChar(char c) {
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return (97 <= Character.toLowerCase(c) && Character.toLowerCase(c) <= 122);
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}
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private static final Scanner scanner = new Scanner(System.in);
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public static void main(String[] args) throws IOException {
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BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
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int n = scanner.nextInt();
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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String s = scanner.nextLine();
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int k = scanner.nextInt();
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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String result = caesarCipher(s, k);
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bufferedWriter.write(result);
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bufferedWriter.newLine();
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bufferedWriter.close();
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scanner.close();
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}
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}

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