Compilare: main.cpp: In function 'int main()': main.cpp:113:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<Points[i].size(); j++) ~^~~~~~~~~~~~~~~~~ main.cpp:126:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j+1<Points[i].size()) ~~~^~~~~~~~~~~~~~~~~