Compilare: main.cpp: In function 'void dfs1(int, int)': main.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tree[nod].size(); ++i) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int, int)': main.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tree[nod].size(); ++i) ~~^~~~~~~~~~~~~~~~~~ main.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tree[nod].size(); ++i) ~~^~~~~~~~~~~~~~~~~~