Create 414-third-maximum-number.js

Author: everthis

414-third-maximum-number.js

@@ -0,0 +1,22 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+const thirdMax = function(nums) {
+    let count = 0, max=mid=small=Number.MIN_SAFE_INTEGER;
+    for (let i in nums) {
+        if (count > 0 && nums[i] === max || count > 1 && nums[i] === mid) continue;
+        count++;
+        if (nums[i] > max) {
+            small = mid;
+            mid = max;
+            max = nums[i];
+        } else if (nums[i] > mid) {
+            small = mid;
+            mid = nums[i];
+        } else if (nums[i] > small) {
+            small = nums[i];
+        }
+    }
+    return count < 3 ? max : small;
+};