Compilare: main.cpp: In function 'int main()': main.cpp:54:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for(int i=0;i<sol.size()-1;i++) ans.push_back({sol[i],sol[i+1]}); | ~^~~~~~~~~~~~~ main.cpp:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(int i=0;i<ans.size();i++){ | ~^~~~~~~~~~~