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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. int main() {
  6.  
  7. 	    int n;
  8.     cin>>n;
  9.     int k1;
  10.     int k2;
  11.     cin>>k1>>k2;
  12.     vector<int> a(n);
  13.  
  14.     for(int i=0;i<n;i++){
  15.         cin>>a[i];
  16.     } 
  17.  
  18.     int c = 0 ; 
  19.  
  20.     for(int j=1 ; j<n-2;j++){
  21.         int c1=0;
  22.         for(int i=0;i<j;i++){
  23.         	if(a[i]+a[j]>k1){
  24.         		c1++;
  25.  
  26.         	}
  27.         }
  28.         int c2 = 0 ; 
  29.         int k = j + 1 ; 
  30.         int l = n-1 ; 
  31.         while(k<l){
  32.             if((a[k]+a[l])>k2){
  33.                 c2 = c2 + l-k;
  34.                 l--;
  35.             }else{
  36.                 k++;
  37.             }
  38.         }
  39.  
  40.         c += c1*c2;
  41.     }
  42.     cout<<c;
  43.     return 0;
  44. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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6 1 3 
1 1 1 1 2 2
stdout
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6
https://ideone.com/xWPbHy
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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