Compilare: user.c: In function ‘bfs’: user.c:27:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (x > 0 && x <= n && y > 0 && y <= m && cost[x][y] == -1) ^ user.c: In function ‘main’: user.c:44:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d%d%d", &n, &m, &pl, &pc, &cl, &cc); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:47:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a[x][y]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~