Compilare: main.cpp: In instantiation of 'int algebra::poly<T>::inv(size_t, int) const [with T = algebra::modular<20173333>; size_t = long unsigned int]': main.cpp:585:24: required from here main.cpp:220:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 220 | for (int i = 1; i < 2*a; ++i) { | ~~^~~~~ main.cpp:224:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 224 | for (int i = 0; i < 2*a; ++i) { | ~~^~~~~ main.cpp:227:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 227 | for (int i = 0; i < 2*a; ++i) { | ~~^~~~~ main.cpp:260:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 260 | for (int i = a; i < 2*a; ++i) ans.a[i] -= C[i-a]; | ~~^~~~~