[lhc0506] WEEK 02 solutions

climbing-stairs/lhc0506.js

@@ -0,0 +1,17 @@
+/**
+ * @param {number} n
+ * @return {number}
+ */
+var climbStairs = function(n) {
+    let preStairs = 0;
+    let curStairs = 1;
+
+
+    for (let i = 0; i < n; i++) {
+        let sum = preStairs + curStairs;
+        preStairs = curStairs;
+        curStairs = sum;
+    }
+
+    return curStairs;
+};

valid-anagram/lhc0506.js

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+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {boolean}
+ */
+var isAnagram = function(s, t) {
+    if (s.length !== t.length) {
+        return false;
+    }
+
+    const charCountMap = {};
+
+    for (let char of s) {
+        charCountMap[char] = (charCountMap[char] || 0) + 1;
+    }
+
+    for (let char of t) {
+        if (!charCountMap[char]) {
+            return false;
+        }
+
+        charCountMap[char] -= 1;
+    }
+
+    return true;
+};