Compilare: main.cpp: In function 'std::string solve(std::vector<int>&)': main.cpp:14:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | if(cnt < v.size()) | ~~~~^~~~~~~~~~ main.cpp:17:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i = 0;i < v.size();++i) | ~~^~~~~~~~~~