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  1.  #include <bits/stdc++.h>
  2.     #define endl '\n'
  3.     #define yes cout<<"YES\n"
  4.     #define no cout<<"NO\n"
  5.     using namespace std;
  6.     void fast(){
  7.         ios_base::sync_with_stdio(NULL);
  8.         cin.tie(0);cout.tie(0);
  9.     }
  10.     bool isbit(int n,int x){
  11.         if((n&(1<<x)))return 1;
  12.         else return 0;
  13.     }
  14.     multiset<int>stl,str;
  15.     int main(){
  16.         fast();
  17.         int t=1;
  18.         //cin>>t;
  19.         while(t--){
  20.             int n,a,x;
  21.             cin>>n>>x;
  22.             vector<pair<int,int>>v;
  23.             for(int i=0;i<n;i++){
  24.                 cin>>a;
  25.                 v.push_back({a,i+1});
  26.             }
  27.             sort(v.begin(),v.end());
  28.             int r=n-1,l=0,sum=0;
  29.             while(l<r){
  30.                 sum=v[l].first+v[r].first;
  31.                 if(sum==x){
  32.                     cout<<v[l].second<<" "<<v[r].second;
  33.                     return 0;
  34.                 }else if(sum>x)r--;
  35.                 else l++;
  36.             }
  37.             cout<<"IMPOSSIBLE";
  38.         }
  39.     }
  40.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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Standard input is empty
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IMPOSSIBLE
https://ideone.com/h5lU6y
language:
C++ (gcc 8.3)
created:
22 hours ago
visibility:
public

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