Compilare: main.cpp: In function 'void disconnect(int, int)': main.cpp:28:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | while(ix[na]<adj[na].size()&&gr[adj[na][ix[na]]]==gr[a]&&vis[adj[na][ix[na]]]) ix[na]++; | ~~~~~~^~~~~~~~~~~~~~~ main.cpp:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | if(ix[na]==adj[na].size()) stka.pop(); | ~~~~~~^~~~~~~~~~~~~~~~ main.cpp:36:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | while(ix[nb]<adj[nb].size()&&gr[adj[nb][ix[nb]]]==gr[b]&&vis[adj[nb][ix[nb]]]) ix[nb]++; | ~~~~~~^~~~~~~~~~~~~~~ main.cpp:37:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if(ix[nb]==adj[nb].size()) stkb.pop(); | ~~~~~~^~~~~~~~~~~~~~~~