Compilare: main.cpp: In function 'bool bfs()': main.cpp:32:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int dfs(int, int)': main.cpp:49:16: warning: statement has no effect [-Wunused-value] for(start[x];start[x]<v[x].size();start[x]++) ~~~~~~~^ main.cpp:49:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(start[x];start[x]<v[x].size();start[x]++) ~~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:96:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ~^~~~~~~~~~~~