From 95d422fef6f82ee27e3a9124cac69428d1ff40b7 Mon Sep 17 00:00:00 2001
From: dmswl6310 <dmswl6310@gmail.com>
Date: Tue, 29 Sep 2026 22:40:20 +0900
Subject: [PATCH] 0929

---
 .../242. Valid Anagram.js"                    | 20 ++++++++++
 .../413. Arithmetic Slices.js"                | 39 +++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 "leetcode3/\355\231\251\354\235\200\354\247\200/242. Valid Anagram.js"
 create mode 100644 "leetcode3/\355\231\251\354\235\200\354\247\200/413. Arithmetic Slices.js"

diff --git "a/leetcode3/\355\231\251\354\235\200\354\247\200/242. Valid Anagram.js" "b/leetcode3/\355\231\251\354\235\200\354\247\200/242. Valid Anagram.js"
new file mode 100644
index 00000000..a192ef93
--- /dev/null
+++ "b/leetcode3/\355\231\251\354\235\200\354\247\200/242. Valid Anagram.js"	
@@ -0,0 +1,20 @@
+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {boolean}
+ */
+var isAnagram = function (s, t) {
+  if (s.length !== t.length) return false;
+  const countMap = new Map();
+
+  for (const char of s) {
+    countMap.set(char, (countMap.get(char) || 0) + 1);
+  }
+
+  for (const char of t) {
+    const count = countMap.get(char);
+    if (count === 0 || count === undefined) return false;
+    countMap.set(char, count - 1);
+  }
+  return true;
+};
diff --git "a/leetcode3/\355\231\251\354\235\200\354\247\200/413. Arithmetic Slices.js" "b/leetcode3/\355\231\251\354\235\200\354\247\200/413. Arithmetic Slices.js"
new file mode 100644
index 00000000..35ce3a8b
--- /dev/null
+++ "b/leetcode3/\355\231\251\354\235\200\354\247\200/413. Arithmetic Slices.js"	
@@ -0,0 +1,39 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var numberOfArithmeticSlices = function (nums) {
+  if (nums.length < 3) return 0;
+  const diff = Array(nums.length - 1);
+  let count = 0;
+
+  for (let i = 0; i < nums.length - 1; i++) {
+    diff[i] = nums[i + 1] - nums[i];
+  }
+
+  let prevDiff = diff[0];
+  let startIndex = 0;
+  for (let i = 1; i < diff.length; i++) {
+    if (diff[i] !== prevDiff) {
+      if (i - 1 !== startIndex) {
+        const sameCount = i - startIndex;
+        let plus = sameCount - 2 + 1;
+        while (plus > 0) {
+          count += plus--;
+        }
+      }
+      startIndex = i;
+      prevDiff = diff[i];
+    }
+  }
+
+  if (startIndex !== diff.length - 1) {
+    const sameCount = diff.length - startIndex;
+    let plus = sameCount - 2 + 1;
+    while (plus > 0) {
+      count += plus--;
+    }
+  }
+
+  return count;
+};