Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:39:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:44:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < lo[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:51:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < hi[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:61:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow == lo[node].size() - 1) ~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:67:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow2 == hi[node].size() - 1) ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~