Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptr[nod]<g[nod].size() && v[id[nod][ptr[nod]]]) ^ user.cpp:49:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ptr[nod]==g[nod].size()){ ^ user.cpp: In function ‘int main()’: user.cpp:63:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.in","r",stdin); ^ user.cpp:64:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.out","w",stdout); ^