Compilare: main.cpp: In function 'void build_L()': main.cpp:26:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int j=0;j<A[i].size();j++){ | ~^~~~~~~~~~~~ main.cpp: In function 'll dfs(int, ll)': main.cpp:38:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(ll& j=ptr[i];j<A[i].size();j++){ | ~^~~~~~~~~~~~