3sum solved

Author: mintheon

3sum/mintheon.java

@@ -0,0 +1,35 @@
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+class Solution {
+  public List<List<Integer>> threeSum(int[] nums) {
+    Arrays.sort(nums);
+
+    Set<List<Integer>> answer = new HashSet<>();
+
+    for(int i = 0; i < nums.length - 2; i++) {
+      int left = i + 1;
+      int right = nums.length - 1;
+
+      while(left < right) {
+        int sum = nums[i] + nums[left] + nums[right];
+
+        if(sum < 0) {
+          left++;
+        } else if(sum > 0) {
+          right--;
+        } else{
+          answer.add(List.of(nums[i], nums[left], nums[right]));
+
+          left++;
+          right--;
+        }
+      }
+    }
+
+    return new ArrayList<>(answer);
+  }
+}