Compilare: main.cpp: In function 'void solve(std::vector<int>&, std::vector<int>&)': main.cpp:99:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<act.size(); ++i) ~^~~~~~~~~~~ main.cpp:101:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<old.size() && a[old[p]].x <= a[act[i]].x) ++p; ~^~~~~~~~~~~ main.cpp:116:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<old.size(); ++i) ~^~~~~~~~~~~ main.cpp:129:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<act.size(); ++i) ~^~~~~~~~~~~ main.cpp: In function 'void Goo(std::vector<int>&, std::vector<int>&)': main.cpp:145:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<act.size(); ++i) ~^~~~~~~~~~~ main.cpp:147:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<old.size() && a[old[p]].y >= a[act[i]].y) ++p; ~^~~~~~~~~~~ main.cpp:159:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<old.size(); ++i) ~^~~~~~~~~~~ main.cpp:165:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<act.size(); ++i) ~^~~~~~~~~~~