Compilare: user.cpp: In function ‘void Sweeping_line()’: user.cpp:180:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(BandX[X.bx].size() > X.poz_bx + 1) ^ user.cpp:188:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(BandY[X.by].size() > X.poz_by + 1) ^ user.cpp:196:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(BandY[X2.by].size() > X2.poz_by + 1) ^ user.cpp:204:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(verifp.poz_bx + 1 < BandX[verifp.bx].size()) ^ user.cpp: In function ‘void Read()’: user.cpp:66:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:69:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp: In function ‘int main()’: user.cpp:232:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana2.in","r",stdin); ^ user.cpp:233:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana2.out","w",stdout); ^