Compilare: user.cpp: In function ‘int main()’: user.cpp:150:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("demolish.in" ,"r", stdin ); ^ user.cpp:151:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("demolish.out","w", stdout); ^ user.cpp:153:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d %d %d", &N, &M, &F, &DX, &DY); ^ user.cpp:157:57: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d %d %d", &X1, &Y1, &X2, &Y2, &C); X1 ++; Y1 ++; ^