Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:66:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int& i = last[node]; i < graph[node].size(); ++i) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:138:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < edges.size(); ++i) ~~^~~~~~~~~~~~~~