3sum

Author: sooooo-an

3sum/sooooo-an.ts

@@ -0,0 +1,30 @@
+function threeSum(nums: number[]): number[][] {
+  nums.sort((a: number, b: number) => a - b);
+  const results: [number, number, number][] = [];
+
+  for (let i = 0; i < nums.length - 2; i++) {
+    if (i > 0 && nums[i] === nums[i - 1]) continue;
+
+    let left = i + 1;
+    let right = nums.length - 1;
+
+    while (left < right) {
+      const current = nums[i] + nums[left] + nums[right];
+      if (current === 0) {
+        results.push([nums[i], nums[left], nums[right]]);
+
+        while (left < right && nums[left] === nums[left + 1]) left++;
+        while (left < right && nums[right] === nums[right - 1]) right--;
+
+        left++;
+        right--;
+      } else if (current < 0) {
+        left++;
+      } else if (current > 0) {
+        right--;
+      }
+    }
+  }
+
+  return results;
+}