add: 三数之和

test/math/3sum.test.js

@@ -0,0 +1,8 @@
+import { threeSum } from '../../src/math/3sum.js'
+
+test('三数之和', () => {
+  expect(threeSum([-1, 0, 1, 2, -1, -4])).toEqual([
+    [-1, -1, 2],
+    [-1, 0, 1]
+  ])
+})