Merge pull request DaleStudy#2432 from DaleStudy/yihyun-kim1

yihyun-kim1 · web-flow · commit 7591ffd398c7 · 2026-03-15T23:39:21.000+09:00
[yihyun-kim1] WEEK 02 Solutions
diff --git a/climbing-stairs/yihyun-kim1.js b/climbing-stairs/yihyun-kim1.js
@@ -0,0 +1,19 @@
+/**
+ * @param {number} n
+ * @return {number}
+ */
+
+const climbStairs = (n) => {
+  if (n <= 2) return n;
+
+  let prev1 = 1;
+  let prev2 = 2;
+
+  for (let i = 3; i <= n; i++) {
+    const current = prev1 + prev2;
+    prev1 = prev2;
+    prev2 = current;
+  }
+
+  return prev2;
+};
diff --git a/valid-anagram/yihyun-kim1.js b/valid-anagram/yihyun-kim1.js
@@ -0,0 +1,22 @@
+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {boolean}
+ */
+const isAnagram = (s, t) => {
+  if (s.length !== t.length) return false;
+
+  const map = new Map();
+
+  for (let char of s) {
+    map.set(char, (map.get(char) || 0) + 1);
+  }
+
+  for (let char of t) {
+    if (!map.has(char)) return false;
+    map.set(char, map.get(char) - 1);
+    if (map.get(char) < 0) return false;
+  }
+
+  return true;
+};
