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  1. /*
  2. * @Author: hungeazy
  3. * @Date:   2026-03-04 23:24:15
  4. * @Last Modified by:   hungeazy
  5. * @Last Modified time: 2026-03-12 19:59:53
  6. */
  7. #include <bits/stdc++.h>
  8. using namespace std;
  9. const int N = 1000010;
  10. int n,x;
  11. pair<int,int> a[N];
  12.  
  13. int main()
  14. {
  15.     ios_base::sync_with_stdio(false); 
  16.     cin.tie(NULL); cout.tie(NULL);
  17.     cin >> n >> x;
  18.     for (int i = 1; i <= n; i++)
  19.     {
  20.         cin >> a[i].first;
  21.         a[i].second = i;
  22.     }
  23.     sort(a+1,a+n+1);
  24.     int l = 1, r = n, ans = -1;
  25.     while (l <= r)
  26.     {
  27.         int mid = (l+r)>>1;
  28.         if (a[mid].first < x) l = mid+1;
  29.         else if (a[mid].first >= x)
  30.         {
  31.             ans = a[mid].second;
  32.             r = mid-1;
  33.         }
  34.     }
  35.     cout << ans;
  36.     return 0;
  37. }
Success #stdin #stdout 0.01s 5308KB
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-1
https://ideone.com/SZoWfY
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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