Compilare: main.cpp: In function 'void upd(int, int)': main.cpp:15:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for( ; p <= euler.size() ; p += p & -p) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void build()': main.cpp:44:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int i = 0 ; i < euler.size() ; i++) | ~~^~~~~~~~~~~~~~