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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4.  
  5. #define SIZE 8
  6.  
  7. int main() {
  8.     int board[SIZE][SIZE];
  9.     int queensPlaced = 0;
  10.  
  11.     srand(time(NULL));
  12.  
  13.     while (queensPlaced < SIZE) {
  14.         for (int r = 0; r < SIZE; r++) {
  15.             for (int c = 0; c < SIZE; c++) {
  16.                 board[r][c] = 0;
  17.             }
  18.         }
  19.         queensPlaced = 0;
  20.  
  21.         for (int q = 0; q < SIZE; q++) {
  22.             int validMoves = 0;
  23.             for (int r = 0; r < SIZE; r++) {
  24.                 for (int c = 0; c < SIZE; c++) {
  25.                     if (board[r][c] == 0) {
  26.                         validMoves++;
  27.                     }
  28.                 }
  29.             }
  30.  
  31.             if (validMoves == 0) {
  32.                 break;
  33.             }
  34.  
  35.             int move = rand() % validMoves;
  36.             int count = 0;
  37.             int placed = 0;
  38.  
  39.             for (int r = 0; r < SIZE && !placed; r++) {
  40.                 for (int c = 0; c < SIZE && !placed; c++) {
  41.                     if (board[r][c] == 0) {
  42.                         if (count == move) {
  43.                             board[r][c] = 1;
  44.                             queensPlaced++;
  45.                             placed = 1;
  46.  
  47.                             for (int i = 0; i < SIZE; i++) {
  48.                                 for (int j = 0; j < SIZE; j++) {
  49.                                     if (board[i][j] == 0 && !(i == r && j == c)) {
  50.                                         if (i == r || j == c || (i - j) == (r - c) || (i + j) == (r + c)) {
  51.                                             board[i][j] = -1;
  52.                                         }
  53.                                     }
  54.                                 }
  55.                             }
  56.                         }
  57.                         count++;
  58.                     }
  59.                 }
  60.             }
  61.         }
  62.     }
  63.  
  64.     for (int r = 0; r < SIZE; r++) {
  65.         for (int c = 0; c < SIZE; c++) {
  66.             if (board[r][c] == 1) {
  67.                 printf(" Q ");
  68.             } else {
  69.                 printf(" . ");
  70.             }
  71.         }
  72.         printf("\n");
  73.     }
  74.  
  75.     return 0;
  76. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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Standard input is empty
stdout
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 .  Q  .  .  .  .  .  . 
 .  .  .  .  Q  .  .  . 
 .  .  .  .  .  .  Q  . 
 Q  .  .  .  .  .  .  . 
 .  .  Q  .  .  .  .  . 
 .  .  .  .  .  .  .  Q 
 .  .  .  .  .  Q  .  . 
 .  .  .  Q  .  .  .  .
https://ideone.com/O5KZ9n
language:
C (gcc 8.3)
created:
1 hour ago
visibility:
public

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