Compilare: main.cpp: In function 'void add(int, int, std::pair<int, int>)': main.cpp:189:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 189 | for (int j = p + 1; j < aib[i].size(); j += j & (-j)) | ~~^~~~~~~~~~~~~~~