Untitled

#include <stdio.h>

#define MAX_N 24
#define MAX_K 100

int N, L, K;
int board[MAX_N][MAX_N];
int num_solutions = 0;

int isSafe(int row, int col) {
    for (int i = 0; i < N; i++) {
        if (board[row][i] || board[i][col])
            return 0;
    }
    return 1;
}

void solve(int placed, FILE *output) {
    if (placed == L) {
        for (int i = 0; i < N; i++) {
            for (int j = 0; j < N; j++) {
                if (board[i][j]) {
                    fprintf(output, "(%d,%d)", i, j);
                    if (i != N - 1 || j != N - 1)
                        fprintf(output, " ");
                }
            }
        }
        fprintf(output, "\n");
        num_solutions++;
        return;
    }

    for (int i = 0; i < N; i++) {
        for (int j = 0; j < N; j++) {
            if (isSafe(i, j)) {
                board[i][j] = 1;
                solve(placed + 1, output);
                board[i][j] = 0;
            }
        }
    }
}

int main() {
    FILE *input = fopen("input.txt", "r");
    FILE *output = fopen("output.txt", "w");

    if (!input || !output) {
        printf("Ошибка при открытии файлов.\n");
        return 1;
    }

    fscanf(input, "%d %d %d", &N, &L, &K);

    for (int i = 0; i < MAX_N; i++) {
        for (int j = 0; j < MAX_N; j++) {
            board[i][j] = 0;
        }
    }
    for (int i = 0; i < K; i++) {
        int x, y;
        fscanf(input, "%d %d", &x, &y);
        board[x][y] = 1;
    }

    solve(0, output);

    if (num_solutions == 0) {
        fprintf(output, "no solutions\n");
    }

    fclose(input);
    fclose(output);

    return 0;
}