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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     long long n,st,dem=0;
  8.     cin>>n;
  9.     int a[n];
  10.     cin>>st;
  11.     for(int i=1;i<=n;i++){
  12.         cin>>a[i];
  13.     }
  14.     for(int i=1;i<=n-1;i++){
  15.         for(int j=i+1;j<=n;j++){
  16.             if(a[i]+a[j]==st) dem++;
  17.         }
  18.     }
  19.     cout<<dem;
  20.     return 0;
  21. }
  22. //bai4
  23.  
Success #stdin #stdout 0s 5304KB
comments (?)
stdin
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10 7
5 2 5 3 4 3 1 6 4 0
stdout
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7
https://ideone.com/udwjZm
Cặp số hoàn hảo
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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