Compilare: main.cpp: In function 'int dfs1(int)': main.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph[node].size();i++){ ~^~~~~~~~~~~~~~~~~~~ main.cpp:34:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int dfs2(int, std::vector<int>&)': main.cpp:38:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<transposed_graph[node].size();i++){ ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:43:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'void solve()': main.cpp:65:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<connected.size();i++){ ~^~~~~~~~~~~~~~~~~ main.cpp:46:6: warning: unused variable 'cnt' [-Wunused-variable] int cnt=0; ^~~