Compilare: user.cpp: In function ‘bool refresh(long int)’: user.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<E[id].size();i++){ ^ user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<E[id].size()-1&&E[id][i+1].pos==def){ ^ user.cpp: In function ‘int main()’: user.cpp:72:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bazaconii.in","r",stdin); ^ user.cpp:73:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bazaconii.out","w",stdout); ^ user.cpp:75:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&t); ^ user.cpp:77:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&n,&m); ^ user.cpp:80:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld%ld",&x,&y,&v); ^