Compilare: user.cpp: In function ‘void bell(int)’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:41:32: warning: narrowing conversion of ‘b’ from ‘long long int’ to ‘int’ inside { } [-Wnarrowing] v[a].push_back({b,cost}); ^ user.cpp:41:32: warning: narrowing conversion of ‘cost’ from ‘long long int’ to ‘int’ inside { } [-Wnarrowing] user.cpp:42:32: warning: narrowing conversion of ‘a’ from ‘long long int’ to ‘int’ inside { } [-Wnarrowing] v[b].push_back({a,cost}); ^ user.cpp:42:32: warning: narrowing conversion of ‘cost’ from ‘long long int’ to ‘int’ inside { } [-Wnarrowing] user.cpp:76:23: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i&(1<<k)) ^