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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5. #define ld long double
  6. #define all(x) (x).begin(), (x).end()
  7. #define debug(x) cerr << #x << " = " << (x) << endl;
  8.  
  9. const int MOD = 1e9 + 7;
  10. const int INF = 1e18;
  11. const ld PI = acos(-1.0);
  12.  
  13. int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }
  14. int lcm(int a, int b) { return a / gcd(a, b) * b; }
  15.  
  16. void solve() {
  17.     int n,y;
  18.     cin >> n >> y;
  19.  
  20.     vector<int>b(n);
  21.     for(int i=0;i<n;i++)cin>> b[i];
  22.  
  23.     int sum=accumulate(b.begin(),b.end(),0);
  24.     vector<vector<int>>dp(n+1,vector<int>(y+1));
  25.  
  26.     for (int i=0; i<=n; i++) dp[i][0] = 1;// 1 way-> not taking anything to make sum=0
  27.  
  28.     for(int i=1;i<=n;i++){
  29.         for(int j=1;j<=y;j++){
  30.             dp[i][j]=(j-b[i-1]>=0 ? dp[i-1][j-b[i-1]]:0)+dp[i-1][j];
  31.         }
  32.     }
  33.     cout<<dp[n][y]<<endl;
  34. }
  35.  
  36. int32_t main() {
  37.     ios::sync_with_stdio(false);
  38.     cin.tie(nullptr);
  39.     solve();
  40.     return 0;
  41. }
Success #stdin #stdout 0.01s 5268KB
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https://ideone.com/LzaoOh
language:
C++14 (gcc 8.3)
created:
17 hours ago
visibility:
public

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