Compilare: main.cpp: In lambda function: main.cpp:110:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:115:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:120:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:121:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < lo[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:127:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:128:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < hi[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:138:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow == lo[node].size() - 1) ~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:145:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow2 == hi[node].size() - 1) ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~