Compilare: user.cpp: In function ‘void lee()’: user.cpp:18:27: warning: unused variable ‘Max’ [-Wunused-variable] int ll, cc, l, c, Max=0,x,y; ^ user.cpp:18:33: warning: unused variable ‘x’ [-Wunused-variable] int ll, cc, l, c, Max=0,x,y; ^ user.cpp:18:35: warning: unused variable ‘y’ [-Wunused-variable] int ll, cc, l, c, Max=0,x,y; ^ user.cpp: In function ‘int main()’: user.cpp:42:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "rover.in", "r", stdin ); ^ user.cpp:43:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "rover.out", "w", stdout); ^ user.cpp:45:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &v ); ^ user.cpp:49:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n,&g ); ^ user.cpp:52:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &a[i][j]); ^