Compilare: main.cpp: In function 'void centroid(int)': main.cpp:109:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<date>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | for(int i=0;i<v.size();i++) | ~^~~~~~~~~ main.cpp:115:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<date>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 115 | while(last+1<v.size()&&v[last+1].c==v[i].c) | ~~~~~~^~~~~~~~~