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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int ans(vector<int>&v,int k){
  5.     int a=0;
  6.    int i=0,j=v.size()-1;
  7.    while(j>i){
  8.      if(v[i]+v[j]>k){
  9.         a+=j-i;
  10.         j--;
  11.      }else{
  12.         i++;
  13.      }
  14.  
  15.    }
  16.    return a;
  17.  
  18.  
  19. }
  20. int main(){
  21.     int n;cin>>n;
  22.     vector<int>v(n);
  23.     int k;cin>>k;
  24.     for(int i=0;i<n;i++){
  25.         cin>>v[i];
  26.     }
  27.     cout<<ans(v,k)<<endl;
  28. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/Eus665
language:
C++14 (gcc 8.3)
created:
16 hours ago
visibility:
public

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