[20251209] BOJ / G5 / 1학년 / 김민진

Author: zinnnn37

zinnnn37/202512/9 BOJ G5 1학년.md

@@ -0,0 +1,55 @@
+```java
+import java.io.*;
+import java.util.StringTokenizer;
+
+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       StringTokenizer st;
+
+    private static int      N;
+    private static int[]    nums;
+    private static long[][] dp;
+
+    public static void main(String[] args) throws IOException {
+        init();
+        sol();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+
+        nums = new int[N];
+        st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < N; i++) {
+            nums[i] = Integer.parseInt(st.nextToken());
+        }
+        dp = new long[N][21];
+        dp[0][nums[0]] = 1;
+    }
+
+    private static void sol() throws IOException {
+        for (int i = 1; i < N - 1; i++) {
+            for (int prev = 0; prev <= 20; prev++) {
+                if (dp[i - 1][prev] == 0) continue;
+
+                int sum = prev + nums[i];
+                int gap = prev - nums[i];
+
+                if (sum <= 20) {
+                    dp[i][sum] += dp[i - 1][prev];
+                }
+                if (gap >= 0) {
+                    dp[i][gap] += dp[i - 1][prev];
+                }
+            }
+        }
+        bw.write(dp[N - 2][nums[N - 1]] + "");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+}
+```