Compilare: user.cpp: In function ‘bool Check()’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<act[i].size();j++){ ^ user.cpp:32:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<act[i].size()-1 && act[i][j+1].beg==def) { ^ user.cpp: In function ‘int main()’: user.cpp:58:38: 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:59:40: 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:61:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&t); ^ user.cpp:63:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&n,&m); ^ user.cpp:67:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld%ld",&x,&y,&vv); ^