Compilare: main.cpp: In function 'int main()': main.cpp:31:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i=0;i<adj[a].size();i++) | ~^~~~~~~~~~~~~~ main.cpp:67:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(int i=0;i<pre[a].size();i++) | ~^~~~~~~~~~~~~~ main.cpp:78:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for(int i=0;i<ans.size();i++) | ~^~~~~~~~~~~