From 493ad57f8c49dcc823f5d3a77e14b7104184d5a8 Mon Sep 17 00:00:00 2001
From: JAEKWANG97 <marmong@naver.com>
Date: Wed, 1 Jul 2026 08:55:49 +0900
Subject: [PATCH 1/2] week 02 initial solutions

---
 climbing-stairs/jaekwang97.java | 15 +++++++++++++++
 valid-anagram/jaekwang97.java   | 21 +++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 climbing-stairs/jaekwang97.java
 create mode 100644 valid-anagram/jaekwang97.java

diff --git a/climbing-stairs/jaekwang97.java b/climbing-stairs/jaekwang97.java
new file mode 100644
index 0000000000..8780c82849
--- /dev/null
+++ b/climbing-stairs/jaekwang97.java
@@ -0,0 +1,15 @@
+class Solution {
+    public int climbStairs(int n) {
+        int[] dp = new int[n + 1];
+        if (n <= 3) return n;
+        dp[1] = 1;
+        dp[2] = 2;
+        dp[3] = 3;
+
+        for (int i = 4; i <= n; i++) {
+            dp[i] = dp[i - 1] + dp[i - 2];
+        }
+
+        return dp[n];
+    }
+}
diff --git a/valid-anagram/jaekwang97.java b/valid-anagram/jaekwang97.java
new file mode 100644
index 0000000000..9e4ca416f2
--- /dev/null
+++ b/valid-anagram/jaekwang97.java
@@ -0,0 +1,21 @@
+import java.util.*;
+
+class Solution {
+    public boolean isAnagram(String s, String t) {
+        int[] count = new int[26];
+
+        for (char c : s.toCharArray()) {
+            count[c - 'a']++;
+        }
+
+        for (char c : t.toCharArray()) {
+            count[c - 'a']--;
+        }
+
+        for (int n : count) {
+            if (n != 0) return false;
+        }
+
+        return true;
+    }
+}

From a319c65a5e84bde6b46b962c5f71bd990498173a Mon Sep 17 00:00:00 2001
From: JAEKWANG97 <marmong@naver.com>
Date: Wed, 1 Jul 2026 09:00:18 +0900
Subject: [PATCH 2/2] product of array except self solution

---
 product-of-array-except-self/jaekwang97.java | 26 ++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 product-of-array-except-self/jaekwang97.java

diff --git a/product-of-array-except-self/jaekwang97.java b/product-of-array-except-self/jaekwang97.java
new file mode 100644
index 0000000000..9ab00399ef
--- /dev/null
+++ b/product-of-array-except-self/jaekwang97.java
@@ -0,0 +1,26 @@
+import java.util.*;
+
+class Solution {
+    public int[] productExceptSelf(int[] nums) {
+        int n = nums.length;
+        int[] right = new int[n + 1];
+        int[] left = new int[n + 1];
+
+        right[0] = 1;
+        for (int i = 1; i <= n; i++) {
+            right[i] = right[i - 1] * nums[i - 1];
+        }
+
+        left[n] = 1;
+        for (int i = n - 1; i >= 0; i--) {
+            left[i] = left[i + 1] * nums[i];
+        }
+
+        int[] answer = new int[n];
+        for (int i = 0; i < n; i++) {
+            answer[i] = right[i] * left[i + 1];
+        }
+
+        return answer;
+    }
+}