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:562:24: required from here main.cpp:217:11: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 217 | if (r < 2*a) { | ~~^~~~~ main.cpp:219:25: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 219 | for (int i = 1; i < 2*a; ++i) { | ~~^~~~~ main.cpp:223:25: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 223 | for (int i = 0; i < a; ++i) { | ~~^~~ main.cpp:229:25: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 229 | for (int i = 1; i < a; ++i) { | ~~^~~ main.cpp:232:25: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 232 | for (int i = 1; i < a; ++i) { | ~~^~~ main.cpp:239:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 239 | for (int i = 0; i < a; ++i) ans.a[i+a] += C.a[i]; | ~~^~~