Compilare: main.cpp: In function 'll solve(int)': main.cpp:16:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | while (i<s.size() && s[i]!=')' && s[i]!=']'){ | ~^~~~~~~~~ main.cpp:45:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for (int i=0; i<v.size(); i++) | ~^~~~~~~~~ main.cpp:51:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for (int i=0; i<v.size(); i++){ | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for (int i=0; i<s.size(); i++) | ~^~~~~~~~~