Compilare: user.cpp: In function ‘int main()’: user.cpp:42:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (ok(a + di[j]) && ok(b + dj[j]) && p[a+di[j]][b+dj[j]] != make_pair(0, 0)) ^ user.cpp:36:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d %d", &n, &k); ^ user.cpp:39:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d %d", &a, &b); ^