Compilare: user.cpp: In function ‘void make_diagonale()’: user.cpp:51:12: warning: unused variable ‘h’ [-Wunused-variable] int i, h, x, y, j, d; ^ user.cpp: In function ‘void solve()’: user.cpp:116:12: warning: unused variable ‘d’ [-Wunused-variable] int i, d, j; ^ user.cpp:116:15: warning: unused variable ‘j’ [-Wunused-variable] int i, d, j; ^ user.cpp: In function ‘void read()’: user.cpp:18:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:23:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &c [i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:146:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("caroiaj.in", "r", stdin); ^ user.cpp:147:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("caroiaj.out", "w", stdout); ^ user.cpp:149:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^