Compilare: main.cpp: In function 'int rec(int)': main.cpp:72:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | if(index == v.size()) | ~~~~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 102 | for(int j = 0;j < s.size();++j) | ~~^~~~~~~~~~ main.cpp:119:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 119 | if(cnt >= v.size() / 2) | ~~~~^~~~~~~~~~~~~~~