Compilare: main.cpp: In function 'int main()': main.cpp:36:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int j = i; j < str.size(); j++) | ~~^~~~~~~~~~~~ main.cpp:42:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::__cxx11::basic_string<char>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for(int j = 0; j < v[i].size(); j++) | ~~^~~~~~~~~~~~~