Compilare: main.cpp: In function 'std::vector<std::pair<double, double> > Solve()': main.cpp:22:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int i = 0;i < v.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(int i = 0;i < Dh.size(); ++i, cout << setprecision(12) << fixed << Dh[i-1].first << ' ' << Dh[i-1].second << '\n'); | ~~^~~~~~~~~~~ main.cpp:57:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for(int i = 0;i < Uh.size(); ++i, cout << setprecision(12) << fixed << Uh[i-1].first << ' ' << Uh[i-1].second << '\n'); | ~~^~~~~~~~~~~