Compilare: user.cpp: In member function ‘void Network::add_edge(int, int, int)’: user.cpp:22:41: warning: narrowing conversion of ‘(((Network*)this)->Network::muc.std::vector<_Tp, _Alloc>::size<Network::edge, std::allocator<Network::edge> >() + 4294967294u)’ from ‘std::vector<Network::edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] v[x].push_back({y,muc.size()-2}); ^ user.cpp:23:41: warning: narrowing conversion of ‘(((Network*)this)->Network::muc.std::vector<_Tp, _Alloc>::size<Network::edge, std::allocator<Network::edge> >() + 4294967295u)’ from ‘std::vector<Network::edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] v[y].push_back({x,muc.size()-1}); ^ user.cpp: In function ‘int main()’: user.cpp:88:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tournament.in", "r", stdin); ^ user.cpp:89:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tournament.out", "w", stdout); ^ user.cpp:91:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:92:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=0;i<n;i++) scanf("%d",&v1[i]); ^ user.cpp:94:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int j=0;j<n;j++) scanf("%d",&v2[i][j]); ^