Compilare: main.cpp: In lambda function: main.cpp:111:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:116:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:121:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:122:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < lo[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:128:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:129:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < hi[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:139:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow == lo[node].size() - 1) ~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:146:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow2 == hi[node].size() - 1) ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~