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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.  
  15. void solve(){
  16.     int n,q;
  17.     cin >> n >> q;
  18.  
  19.     vector<int>v(n);
  20.     for(auto &x : v) cin >> x;
  21.  
  22.     while(q--){
  23.         int x;
  24.         cin >> x;
  25.  
  26.         int l = 0, r = n-1, ans = -1, mid;
  27.  
  28.         while(l<=r){
  29.             mid = (l+r)/2;
  30.             if(v[mid] == x){
  31.                 ans = mid;
  32.                 break;
  33.             }
  34.             else if(v[mid] > x){
  35.                 r = mid - 1;
  36.             }
  37.             else{
  38.                 l = mid + 1;
  39.             }
  40.         }
  41.         if(ans == -1) cout << ans << '\n';
  42.         else cout << ans+1 << '\n';
  43.     }
  44. }
  45.  
  46.  
  47. signed main(){
  48.     FastIO();
  49.  
  50.     int t = 1;
  51.     //cin >> t;
  52.  
  53.     while (t--){
  54.         solve();
  55.     }
  56.     return 0;
  57. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
2 4
5 10
1
2
7
10
stdout 
-1
-1
-1
2
https://ideone.com/S3jDe6
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language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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