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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. long long cnt0(long long n) {
  5.     long long res = 0;
  6.     while (n) {
  7.         res += n / 5;
  8.         n /= 5;
  9.     }
  10.     return res;
  11. }
  12.  
  13. long long calc(long long n) {
  14.     long long l = 1, r = 5 * n, res = n;
  15.     while (l <= r) {
  16.         long long mid = (l + r) / 2;
  17.         if (cnt0(mid) >= n) res = mid, r = mid - 1;
  18.         else l = mid + 1;
  19.     }
  20.     return res;
  21. }
  22.  
  23.  
  24. int main() {
  25.     ios::sync_with_stdio(0);
  26.     cin.tie(0);
  27.  
  28.     int numTest;
  29.     cin >> numTest;
  30.  
  31.     while (numTest--) {
  32.         long long n; cin >> n;
  33.         cout << calc(n) << '\n';
  34.     }
  35.  
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/6wxD11
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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