solve 3sum

Author: JangAyeon

3sum/JangAyeon.js

@@ -0,0 +1,31 @@
+var threeSum = function (nums) {
+  let res = [];
+  nums.sort((a, b) => a - b);
+
+  for (let i = 0; i < nums.length; i++) {
+    if (i > 0 && nums[i] === nums[i - 1]) {
+      continue;
+    }
+
+    let j = i + 1;
+    let k = nums.length - 1;
+
+    while (j < k) {
+      let total = nums[i] + nums[j] + nums[k];
+
+      if (total > 0) {
+        k--;
+      } else if (total < 0) {
+        j++;
+      } else {
+        res.push([nums[i], nums[j], nums[k]]);
+        j++;
+
+        while (nums[j] === nums[j - 1] && j < k) {
+          j++;
+        }
+      }
+    }
+  }
+  return res;
+};