Compilare: user.cpp: In function ‘int main()’: user.cpp:51:35: warning: narrowing conversion of ‘(((int)it.std::_Rb_tree_iterator<_Tp>::operator-><std::pair<const int, short int> >()->std::pair<const int, short int>::second) + 1)’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] update[f].push_back(tipe{act, 1+it->second}); ^ user.cpp:54:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<update[i].size(); j++) ^ user.cpp:26:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d\n",&k); ^ user.cpp:27:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v+1,Q,in); ^ In file included from /usr/include/stdio.h:934:0, from /usr/include/c++/4.8/cstdio:42, from user.cpp:1: In function ‘char* fgets(char*, int, FILE*)’, inlined from ‘int main()’ at user.cpp:27:20: /usr/include/i386-linux-gnu/bits/stdio2.h:253:58: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer [enabled by default] return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^