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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. const int maxN = 100000;
  6. // bool u[maxN];
  7. int a[maxN];
  8. int b[maxN];
  9. int main() {
  10.     int N;
  11.     cin >> N;
  12.     vector<bool> u(N);
  13.     long long total = 0;
  14.     for (int i = 0; i < N; ++i) {
  15.         a[i] = rand() % N;
  16.         b[i] = rand() % N;
  17.     }
  18.     for (int it = 0; it < N; ++it) {
  19.         for (int i = 0; i < N; ++i) {
  20.             int x = a[i];
  21.             u[x] = 1;
  22.         }
  23.         for (int i = 0; i < N; ++i) {
  24.             int x = b[i];
  25.             u[x] = 0;
  26.         }
  27.         for (int i = 0; i < N; ++i) {
  28.             total += u[i];
  29.             u[i] = 0;
  30.         }
  31.     }
  32.     cout << total / N << endl;
  33.     return 0;
  34. }
Success #stdin #stdout 0.45s 4556KB
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https://ideone.com/wLKg1A
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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