Compilare: user.cpp: In function ‘int main()’: user.cpp:85:34: warning: narrowing conversion of ‘nr’ from ‘int’ to ‘char’ inside { } [-Wnarrowing] init_g[a].push_back({b, nr}); ^ user.cpp:86:34: warning: narrowing conversion of ‘nr’ from ‘int’ to ‘char’ inside { } [-Wnarrowing] init_g[b].push_back({a, nr}); ^