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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3.  
  4. using namespace std;
  5.  
  6. int n, k, x[100];
  7. bool ok = true;
  8. int mark[100];
  9.  
  10. void init(){
  11.    for(int i = 1; i <= k; i++){
  12.       cin >> x[i];
  13.       mark[x[i]] = 1;
  14.    }
  15. }
  16.  
  17. void result(){
  18.    for(int i = 1; i <= k; i++){
  19.       cout << x[i] << ' ';
  20.    }
  21.    cout << endl;
  22. }
  23.  
  24. void next_combination(){
  25.    int i = k;
  26.    while(i > 0 && x[i] == n - k + i){
  27.       i--;
  28.    }
  29.    if(i == 0){
  30.       ok = false;
  31.    }
  32.    else{
  33.       x[i]++;
  34.       for(int j = i + 1; j <= k; j++){
  35.          x[j] = x[j - 1] + 1;
  36.       }
  37.    }
  38. }
  39.  
  40. int main(){
  41.    int t; cin >> t;
  42.    while(t--){
  43.       cin >> n >> k;
  44.       init();
  45.  
  46.       next_combination();
  47.       int cnt = 0;
  48.       if(!ok){
  49.          cnt = k;
  50.          ok = true;
  51.       }
  52.       else{
  53.          int tmp = 0;
  54.          for(int i = 1; i <= n; i++){
  55.             if(mark[x[i]] == 1){
  56.                tmp++;
  57.                mark[x[i]] = 0;
  58.             }
  59.          }
  60.          cnt = k - tmp;
  61.       }
  62.       for(int i = 1; i <= n; i++){
  63.          mark[i] = 0;
  64.       }
  65.       cout << cnt << endl;
  66.    }
  67. }
  68.  
Success #stdin #stdout 0.08s 5288KB
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https://ideone.com/Hzi1d4
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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