Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < lo[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < hi[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:63:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow == lo[node].size() - 1) ~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:71:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow2 == hi[node].size() - 1) ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:69:27: warning: 'itnow2' is used uninitialized in this function [-Wuninitialized] ans = max(ans, itnow2 + 1); ~~~~~~~^~~