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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define FAST ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  4. typedef long long ll;
  5.  
  6. const int MAX = 8;
  7. int solutions=0;
  8. bool visitedCol[MAX], rightDia[2*MAX+1],leftDia[2*MAX+1],available[MAX][MAX];
  9.  
  10. void Queens(int w){
  11.     if (w == 8){
  12.         solutions++;
  13.         return;
  14.     }
  15.     for (int k = 0;k <8;k++){
  16.         if(!visitedCol[k]&&!rightDia[k+w]&&!leftDia[MAX+k-w]&&!available[w][k]){
  17.             visitedCol[k] = rightDia[k+w] = leftDia[MAX+k-w] = 1;
  18.             Queens(w+1);
  19.             visitedCol[k] = rightDia[k+w] = leftDia[MAX+k-w] = 0;
  20.         }
  21.     }
  22.  
  23.  
  24.  
  25. }
  26.  
  27. int main() {
  28.     FAST
  29.     char c;
  30.     for (int i = 0;i<8;i++){
  31.         for (int j = 0;j<8;j++){
  32.             cin >> c;
  33.             if (c == '*'){
  34.                 available[i][j]=1;
  35.             }
  36.         }
  37.     }
  38.     Queens(0);
  39.  
  40.     cout << solutions << "\n";
  41.     //system("pause");
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/T9BW0s
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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