Compilare: main.cpp: In function 'void solve(std::vector<int>)': main.cpp:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i = 0; i < v.size(); i += 2) | ~~^~~~~~~~~~ main.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i = 1; i < v.size(); i += 2) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 0; i < ans.size(); i++) | ~~^~~~~~~~~~~~