Merge pull request #1575 from AlgorithmWithGod/ksinji

[20251203] BOJ / G5 / 1학년 / 강신지

Author: ShinHeeEul

ksinji/202512/03 BOJ 1학년.md

@@ -0,0 +1,42 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        int n = Integer.parseInt(br.readLine());
+        int[] num = new int[n];
+
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < n; i++) {
+            num[i] = Integer.parseInt(st.nextToken());
+        }
+
+        long[][] dp = new long[n - 1][21];
+
+        dp[0][num[0]] = 1;
+
+        for (int i = 1; i < n - 1; i++) {
+            for (int sum = 0; sum <= 20; sum++) {
+                if (dp[i - 1][sum] == 0) continue;
+
+                int plus = sum + num[i];
+                int minus = sum - num[i];
+
+                if (plus <= 20) {
+                    dp[i][plus] += dp[i - 1][sum];
+                }
+                if (minus >= 0) {
+                    dp[i][minus] += dp[i - 1][sum];
+                }
+            }
+        }
+
+        int target = num[n - 1];
+        System.out.println(dp[n - 2][target]);
+    }
+}
+
+```