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Added Two Sum problem solution in Java #15

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Added Two Sum problem solution in Java #15

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15 changes: 15 additions & 0 deletions Solved-Problems/Two_Sum/Solution.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
import java.util.*;

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[reviewdog] reported by reviewdog 🐶
Using the '.*' form of import should be avoided - java.util.*.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:1:17: warning: Using the '.*' form of import should be avoided - java.util.*. (com.puppycrawl.tools.checkstyle.checks.imports.AvoidStarImportCheck)
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@iamwatchdogs iamwatchdogs Oct 20, 2025

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It's a good practice to use only imports that are necessary.

Suggested change
import java.util.*;
import java.util.HashMap;
import java.util.Map;


class Solution {
public int[] twoSum(int[] nums, int target) {

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'method def modifier' has incorrect indentation level 4, expected level should be 2.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:4:5: warning: 'method def modifier' has incorrect indentation level 4, expected level should be 2. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
Map<Integer, Integer> map = new HashMap<>();

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'method def' child has incorrect indentation level 8, expected level should be 4.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:5:9: warning: 'method def' child has incorrect indentation level 8, expected level should be 4. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
for (int i = 0; i < nums.length; i++) {

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'for' has incorrect indentation level 8, expected level should be 4.

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/github/workspace/./Solved-Problems/Two_Sum/Solution.java:6:9: warning: 'for' has incorrect indentation level 8, expected level should be 4. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
int complement = target - nums[i];

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'for' child has incorrect indentation level 12, expected level should be 6.

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/github/workspace/./Solved-Problems/Two_Sum/Solution.java:7:13: warning: 'for' child has incorrect indentation level 12, expected level should be 6. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
if (map.containsKey(complement)) {

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'if' has incorrect indentation level 12, expected level should be 6.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:8:13: warning: 'if' has incorrect indentation level 12, expected level should be 6. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
return new int[]{map.get(complement), i};

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'if' child has incorrect indentation level 16, expected level should be 8.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:9:17: warning: 'if' child has incorrect indentation level 16, expected level should be 8. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
}

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'if rcurly' has incorrect indentation level 12, expected level should be 6.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:10:13: warning: 'if rcurly' has incorrect indentation level 12, expected level should be 6. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
map.put(nums[i], i);

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'for' child has incorrect indentation level 12, expected level should be 6.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:11:13: warning: 'for' child has incorrect indentation level 12, expected level should be 6. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
}

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'for rcurly' has incorrect indentation level 8, expected level should be 4.

Raw Output:
/github/workspace/./Solved-Problems/Two_Sum/Solution.java:12:9: warning: 'for rcurly' has incorrect indentation level 8, expected level should be 4. (com.puppycrawl.tools.checkstyle.checks.indentation.IndentationCheck)
return new int[]{};
}
}
Comment on lines +3 to +15
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@iamwatchdogs iamwatchdogs Oct 20, 2025

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Please format your code to pass the linting checks.

Suggested change
class Solution {
public int[] twoSum(int[] nums, int target) {
Map<Integer, Integer> map = new HashMap<>();
for (int i = 0; i < nums.length; i++) {
int complement = target - nums[i];
if (map.containsKey(complement)) {
return new int[]{map.get(complement), i};
}
map.put(nums[i], i);
}
return new int[]{};
}
}
class Solution {
public int[] twoSum(int[] nums, int target) {
Map<Integer, Integer> map = new HashMap<>();
for (int i = 0; i < nums.length; i++) {
int complement = target - nums[i];
if (map.containsKey(complement)) {
return new int[] {map.get(complement), i};
}
map.put(nums[i], i);
}
return new int[] {};
}
}

1 change: 1 addition & 0 deletions index.md
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@iamwatchdogs iamwatchdogs Oct 20, 2025

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Please revert the changes for this file. These changes will be updated automatically by the automation scripts when your PR is successfully merged.

Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ Welcome to **Data Structures and Algorithms**, your friendly initiation into the
- [Backspace_String_Compare](Solved-Problems/Backspace_String_Compare "goto Backspace_String_Compare")
- [Longest_Substring_Without_Repeating_Characters](Solved-Problems/Longest_Substring_Without_Repeating_Characters "goto Longest_Substring_Without_Repeating_Characters")
- [Valid_Anagram](Solved-Problems/Valid_Anagram "goto Valid_Anagram")
- [Two Sum](./Two_Sum/Solution.java "goto Two_Sum problem and finding target in an array LeetCode - 1")
<!-- TABLE OF CONTENT ENDS -->

# Table of Contribution
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