import java.io.*; import java.util.*; public class Main { static int N; static int S; static int ans = 0; static int[] arr; static StringTokenizer st; public static void backtracking(int idx, int sum) { if(idx == N) { if(sum == S) { ans++; } return; } backtracking(idx+1, sum); backtracking(idx+1, sum+arr[idx]); } public static void main(String[] args) throws IOException{ BufferedReader br = new ..
