[20260115] BOJ / G5 / 1학년 / 한종욱

Author: Ukj0ng

Ukj0ng/202601/15 BOJ G5 1학년.md

@@ -0,0 +1,47 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static long[][] dp;
+    private static int[] arr;
+    private static int N;
+
+    public static void main(String[] args) throws IOException {
+        init();
+
+        bw.write(dp[N-1][arr[N]] + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+        arr = new int[N+1];
+        dp = new long[N][21];
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        for (int i = 1; i <= N; i++) {
+            arr[i] = Integer.parseInt(st.nextToken());
+        }
+
+        dp[1][arr[1]] = 1;
+
+        for (int i = 2; i < N; i++) {
+            for (int j = 0; j <= 20; j++) {
+                int lower = j - arr[i];
+                if (lower >= 0 && dp[i-1][lower] > 0) {
+                    dp[i][j] += dp[i-1][lower];
+                }
+                int upper = j + arr[i];
+                if (upper <= 20 && dp[i-1][upper] > 0) {
+                    dp[i][j] += dp[i-1][upper];
+                }
+            }
+        }
+    }
+}
+```