Compilare: main.cpp: In function 'std::vector<int> ntt(const std::vector<int>&, int)': main.cpp:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for (int i = 0; i < poly.size(); ++i) | ~~^~~~~~~~~~~~~ main.cpp:54:23: 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 < poly.size(); ++i) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'void dump_poly(std::vector<int>&)': main.cpp:70:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for (int i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> mul_poly(std::vector<int>, std::vector<int>)': main.cpp:90:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for (int i = 0; i < p1.size(); ++i) | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:135:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 135 | for (int i = 0; i < res.size(); ++i) { | ~~^~~~~~~~~~~~