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  1. #include <iostream>
  2. #include <vector>
  3. #include <bits/stdc++.h>
  4. using namespace std;
  5.  
  6. const int N = 100 + 10;
  7. int a[N];
  8. int n, x;
  9. int dp[N][10010];
  10.  
  11. int f(int pos, int sum) {
  12.     if(sum == x) return 1; //porque encontre un conjunto de numeros que suman x
  13.     if(sum > x) return 0; //porque esta suma no me sirve
  14.     if(pos == n) return 0; //llego al final de los elementos sin sumar x
  15.  
  16.     if(dp[pos][sum] == -1) {
  17.         int ans = 0;
  18.         ans = ans + f(pos + 1, sum + a[pos]); //tomo a[pos]
  19.         ans = ans + f(pos + 1, sum); //no tomo a[pos]
  20.         dp[pos][sum] = ans;
  21.     }
  22.     return dp[pos][sum];
  23. }
  24.  
  25. int main () {
  26.     #ifndef ONLINE_JUDGE
  27.         freopen("input.txt", "r", stdin);
  28.         freopen("output.txt", "w", stdout);
  29.     #endif
  30.     cin >> n >> x;
  31.     for(int i = 0; i < n; i++) 
  32.         cin >> a[i];
  33.  
  34.     for(int i = 0; i < N; i++) 
  35.         for(int j = 0; j < 10010; j++)
  36.             dp[i][j] = -1;
  37.     //memset(dp, -1, sizeof dp);
  38.  
  39.     cout << f(0, 0) << "\n";
  40.  
  41.     return 0;
  42. }
Success #stdin #stdout 0.01s 7920KB
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stdin 
Standard input is empty
stdout 
1
https://ideone.com/wxvPGY
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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