Compilare: user.cpp: In function ‘int main()’: user.cpp:87:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < way.size(); i++){ ^ user.cpp:91:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int kk = i; kk < way.size(); kk++) way[kk]->isSolution(); ^ user.cpp:60:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.in","r",stdin); ^ user.cpp:61:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.out","w",stdout); ^ user.cpp:63:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp: In member function ‘void Point::read()’: user.cpp:23:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d %c\n",&x,&y,&color); ^