Compilare: main.cpp: In function 'int solve(int, int)': main.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | if(index == s.size()) | ~~~~~~^~~~~~~~~~~ main.cpp:18:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 0;i < p[c].size();++i) | ~~^~~~~~~~~~~~~