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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define int long long
  5. #define yes cout << "YES\n";
  6. #define no cout << "NO\n";
  7.  
  8.  
  9. void FastIO(){
  10.     ios_base::sync_with_stdio(false);
  11.     cin.tie(nullptr);
  12.     cout.tie(nullptr);
  13. }
  14. ///Sum of two values
  15. void solve(){
  16.     int n,x; cin >> n >> x; 
  17.  
  18.     vector<int>vec(n+1); 
  19.     map<int,pair<int,int>> freq; 
  20.  
  21.     for(int i = 1; i <= n; i++){
  22.     	cin >> vec[i]; 
  23.     }
  24.  
  25.     int l,r; bool flg = false; 
  26.     for(int i = 1; i <= n; i++){
  27.     	if(freq[x-vec[i]].second > 0){
  28.     		flg = true; 
  29.     		l = freq[x-vec[i]].first; 
  30.     		r = i; 
  31.     		break; 
  32.     	}
  33.  
  34.     	freq[vec[i]].first = i; 
  35.     	freq[vec[i]].second++; 
  36.     }
  37.     if(flg){
  38.     	cout << l << " " << r; 
  39.     }
  40.     else{
  41.     	cout << "IMPOSSIBLE"; 
  42.     }
  43. }
  44.  
  45. signed main(){
  46.     FastIO();
  47.  
  48.     int t = 1;
  49.     //cin >> t;
  50.  
  51.     while(t--){
  52.         solve();
  53.     }
  54.     return 0;
  55. }
Success #stdin #stdout 0.01s 5276KB
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stdin
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4 8
2 7 5 1
stdout
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2 4
https://ideone.com/9zRxXR
https://v...content-available-to-author-only...e.net/problem/CSES-1640
language:
C++14 (gcc 8.3)
created:
9 hours ago
visibility:
public

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