Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < graph[node1].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:24:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < graph[node2].size(); j++ ){ ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < graph[i].size(); j++ ){ ~~^~~~~~~~~~~~~~~~~