Compilare: main.cpp: In function 'int main()': main.cpp:30:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(i = 0; i < S.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'void solve(int)': main.cpp:45:9: warning: value computed is not used [-Wunused-value] 45 | +v[v.size() - 1]; main.cpp:50:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int i = 0; i < v.size(); ++i) | ~~^~~~~~~~~~ main.cpp:55:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 55 | while(v.size() < n) | ~~~~~~~~~^~~