diff --git a/src/main/java/com/thealgorithms/stacks/ValidParentheses.java b/src/main/java/com/thealgorithms/stacks/ValidParentheses.java new file mode 100644 index 000000000000..2cc616a38826 --- /dev/null +++ b/src/main/java/com/thealgorithms/stacks/ValidParentheses.java @@ -0,0 +1,74 @@ +package com.thealgorithms.stacks; + +import java.util.HashMap; +import java.util.Map; +import java.util.Stack; + +/** + * Valid Parentheses Problem + * + * Given a string containing just the characters '(', ')', '{', '}', '[' and ']', + * determine if the input string is valid. + * + * An input string is valid if: + * 1. Open brackets must be closed by the same type of brackets. + * 2. Open brackets must be closed in the correct order. + * 3. Every close bracket has a corresponding open bracket of the same type. + * + * Examples: + * Input: "()" + * Output: true + * + * Input: "()[]{}" + * Output: true + * + * Input: "(]" + * Output: false + * + * Input: "([)]" + * Output: false + * + * @author Gokul45-45 + */ +public final class ValidParentheses { + private ValidParentheses() { + } + + /** + * Checks if the given string has valid parentheses + * + * @param s the input string containing parentheses + * @return true if valid, false otherwise + */ + public static boolean isValid(String s) { + if (s == null || s.length() % 2 != 0) { + return false; + } + + Map parenthesesMap = new HashMap<>(); + parenthesesMap.put('(', ')'); + parenthesesMap.put('{', '}'); + parenthesesMap.put('[', ']'); + + Stack stack = new Stack<>(); + + for (char c : s.toCharArray()) { + if (parenthesesMap.containsKey(c)) { + // Opening bracket - push to stack + stack.push(c); + } else { + // Closing bracket - check if it matches + if (stack.isEmpty()) { + return false; + } + char openBracket = stack.pop(); + if (parenthesesMap.get(openBracket) != c) { + return false; + } + } + } + + // Stack should be empty if all brackets are matched + return stack.isEmpty(); + } +} diff --git a/src/test/java/com/thealgorithms/stacks/ValidParenthesesTest.java b/src/test/java/com/thealgorithms/stacks/ValidParenthesesTest.java new file mode 100644 index 000000000000..39014780caa9 --- /dev/null +++ b/src/test/java/com/thealgorithms/stacks/ValidParenthesesTest.java @@ -0,0 +1,32 @@ +package com.thealgorithms.stacks; + +import static org.junit.jupiter.api.Assertions.assertFalse; +import static org.junit.jupiter.api.Assertions.assertTrue; + +import org.junit.jupiter.api.Test; + +class ValidParenthesesTest { + + @Test + void testValidParentheses() { + assertTrue(ValidParentheses.isValid("()")); + assertTrue(ValidParentheses.isValid("()[]{}")); + assertTrue(ValidParentheses.isValid("{[]}")); + assertTrue(ValidParentheses.isValid("")); + } + + @Test + void testInvalidParentheses() { + assertFalse(ValidParentheses.isValid("(]")); + assertFalse(ValidParentheses.isValid("([)]")); + assertFalse(ValidParentheses.isValid("{{{")); + assertFalse(ValidParentheses.isValid("}")); + assertFalse(ValidParentheses.isValid("(")); + } + + @Test + void testNullAndOddLength() { + assertFalse(ValidParentheses.isValid(null)); + assertFalse(ValidParentheses.isValid("(()")); + } +}