diff --git a/solutions/3sum.ts b/solutions/3sum.ts
new file mode 100644
index 0000000..b51e148
--- /dev/null
+++ b/solutions/3sum.ts
@@ -0,0 +1,53 @@
+// 15. 3Sum
+// https://leetcode.com/problems/3sum/
+export default function threeSum(nums: number[]): number[][] {
+ const triplets: [number, number, number][] = [];
+
+ nums.sort((a, b) => a - b);
+
+ for (let i = 0; i < nums.length - 2; ++i) {
+ if (nums[i] > 0) break;
+ if (nums[i] === nums[i - 1]) continue;
+
+ let left = i + 1;
+ let right = nums.length - 1;
+ let target = -nums[i];
+
+ while (left < right) {
+ if (nums[left] + nums[right] < target) {
+ while (nums[left + 1] === nums[left]) {
+ left += 1;
+ }
+
+ left += 1;
+
+ continue;
+ }
+
+ if (nums[left] + nums[right] > target) {
+ while (nums[right - 1] === nums[right]) {
+ right -= 1;
+ }
+
+ right -= 1;
+
+ continue;
+ }
+
+ triplets.push([nums[i], nums[left], nums[right]]);
+
+ while (nums[left + 1] === nums[left]) {
+ left += 1;
+ }
+
+ while (nums[right - 1] === nums[right]) {
+ right -= 1;
+ }
+
+ left += 1;
+ right -= 1;
+ }
+ }
+
+ return triplets;
+}
diff --git a/solutions/3sum_test.ts b/solutions/3sum_test.ts
new file mode 100644
index 0000000..c64366e
--- /dev/null
+++ b/solutions/3sum_test.ts
@@ -0,0 +1,3024 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import threeSum from "./3sum.ts";
+
+test("15. 3Sum", () => {
+ assertEquals(threeSum([-1, 0, 1, 2, -1, -4]).sort(), [
+ [-1, -1, 2],
+ [-1, 0, 1]
+ ]);
+ assertEquals(
+ threeSum([-2, -1, 1, 0, -1, 1, 0, 0, -1, 1, -1, 0, 0, 0, -1, 1]).sort(),
+ [[-1, 0, 1], [-2, 1, 1], [0, 0, 0]]
+ );
+ assertEquals(threeSum([0, 0]), []);
+ assertEquals(
+ threeSum([-4, -2, -2, -2, 0, 1, 2, 2, 2, 3, 3, 4, 4, 6, 6]).sort(),
+ [[-2, -2, 4], [-2, 0, 2], [-4, -2, 6], [-4, 0, 4], [-4, 1, 3], [-4, 2, 2]]
+ );
+ assertEquals(
+ threeSum([
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