Compilare: main.cpp: In function 'long long int solve(std::vector<std::pair<int, int> >&)': main.cpp:8:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 8 | for(int i = 0;i < v.size();++i) | ~~^~~~~~~~~~ main.cpp:15:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int j = 0;j < vals[i].size();j += 2) | ~~^~~~~~~~~~~~~~~~ main.cpp:20:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i = 0;i < vals[1].size();i += 2) | ~~^~~~~~~~~~~~~~~~