add 455, 477, 646 scripts.

Author: everthis

455-assign-cookies.js

@@ -0,0 +1,15 @@
+/**
+ * @param {number[]} g
+ * @param {number[]} s
+ * @return {number}
+ */
+const findContentChildren = function(g, s) {
+  s.sort((a, b) => a - b);
+  g.sort((a, b) => a - b);
+
+  let i = 0;
+  for (let j = 0; i < g.length && j < s.length; j++) {
+    if (g[i] <= s[j]) i++;
+  }
+  return i;
+};

477-total-hamming-distance.js

@@ -0,0 +1,14 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+const totalHammingDistance = function(nums) {
+  let total = 0,
+    n = nums.length;
+  for (let j = 0; j < 32; j++) {
+    let bitCount = 0;
+    for (let i = 0; i < n; i++) bitCount += (nums[i] >> j) & 1;
+    total += bitCount * (n - bitCount);
+  }
+  return total;
+};

646-maximum-length-of-pair-chain.js

@@ -0,0 +1,16 @@
+/**
+ * @param {number[][]} pairs
+ * @return {number}
+ */
+const findLongestChain = function(pairs) {
+  pairs.sort((a, b) => a[1] - b[1]);
+  let cur = Number.MIN_SAFE_INTEGER;
+  let res = 0;
+  for (let i = 0; i < pairs.length; i++) {
+    if (cur < pairs[i][0]) {
+      cur = pairs[i][1];
+      res += 1;
+    }
+  }
+  return res;
+};