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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int n,l,r,k;
  6. pair<int,int>a[200009];
  7. int main(){
  8.     cin>>n>>k;
  9.     for(int i=1;i<=n;i++){
  10.         cin>>a[i].first;
  11.         a[i].second=i;
  12.     }
  13.     sort(a+1,a+n+1);
  14.     l=1; r=n;
  15.     while(l<r){
  16.         if(a[l].first+a[r].first<k){
  17.             l++;
  18.         } 
  19.         else if(a[l].first+a[r].first>k){
  20.             r--;
  21.         }
  22.         else {
  23.             break;
  24.         }
  25.     }
  26.     if(l==r) cout<<"IMPOSSIBLE"<<endl;
  27.     else  cout<<a[l].second<<" "<<a[r].second<<endl;
  28. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/Hwtks5
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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