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  1. #include <stdio.h>
  2.  
  3. #define SIZE 8
  4.  
  5. int main() {
  6.     int board[SIZE][SIZE] = {0};
  7.     int queensPlaced = 0;
  8.  
  9.     while (queensPlaced < SIZE) {
  10.         int minEliminated = 65;
  11.         int bestRow = -1;
  12.         int bestCol = -1;
  13.  
  14.         for (int r = 0; r < SIZE; r++) {
  15.             for (int c = 0; c < SIZE; c++) {
  16.                 if (board[r][c] == 0) {
  17.                     int eliminated = 0;
  18.                     for (int i = 0; i < SIZE; i++) {
  19.                         for (int j = 0; j < SIZE; j++) {
  20.                             if (board[i][j] == 0 && !(i == r && j == c)) {
  21.                                 if (i == r || j == c || (i - j) == (r - c) || (i + j) == (r + c)) {
  22.                                     eliminated++;
  23.                                 }
  24.                             }
  25.                         }
  26.                     }
  27.                     if (eliminated < minEliminated) {
  28.                         minEliminated = eliminated;
  29.                         bestRow = r;
  30.                         bestCol = c;
  31.                     }
  32.                 }
  33.             }
  34.         }
  35.  
  36.         if (bestRow != -1) {
  37.             board[bestRow][bestCol] = 1;
  38.             queensPlaced++;
  39.             for (int i = 0; i < SIZE; i++) {
  40.                 for (int j = 0; j < SIZE; j++) {
  41.                     if (board[i][j] == 0 && (i == bestRow || j == bestCol || (i - j) == (bestRow - bestCol) || (i + j) == (bestRow + bestCol))) {
  42.                         board[i][j] = -1;
  43.                     }
  44.                 }
  45.             }
  46.         } else {
  47.             break;
  48.         }
  49.     }
  50.  
  51.     for (int r = 0; r < SIZE; r++) {
  52.         for (int c = 0; c < SIZE; c++) {
  53.             if (board[r][c] == 1) {
  54.                 printf(" Q ");
  55.             } else {
  56.                 printf(" . ");
  57.             }
  58.         }
  59.         printf("\n");
  60.     }
  61.  
  62.     return 0;
  63. }
Success #stdin #stdout 0.01s 5296KB
comments (?)
stdin
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Standard input is empty
stdout
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 Q  .  .  .  .  .  .  . 
 .  .  .  Q  .  .  .  . 
 .  .  .  .  .  Q  .  . 
 .  .  .  .  .  .  .  Q 
 .  Q  .  .  .  .  .  . 
 .  .  .  .  Q  .  .  . 
 .  .  Q  .  .  .  .  . 
 .  .  .  .  .  .  .  .
https://ideone.com/6B1hZC
language:
C (gcc 8.3)
created:
1 hour ago
visibility:
public

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