Compilare: main.cpp: In constructor 'Permutation::Permutation(std::vector<int>&)': main.cpp:13:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i = 1; i < x.size(); i ++) | ~~^~~~~~~~~~ main.cpp: In member function 'Permutation Permutation::operator*(Permutation&)': main.cpp:20:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i = 1; i < v.size(); i ++) | ~~^~~~~~~~~~ main.cpp: In member function 'Permutation Permutation::neutral()': main.cpp:29:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i = 1; i < v.size(); i ++) | ~~^~~~~~~~~~ main.cpp: In member function 'Permutation Permutation::inverse()': main.cpp:37:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int i = 1; i < v.size(); i ++) | ~~^~~~~~~~~~ main.cpp: In member function 'void Permutation::print()': main.cpp:44:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int i = 1; i < v.size() ; i++) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:87:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 87 | for(int i = 1; i < inv.v.size(); i ++) { | ~~^~~~~~~~~~~~~~ main.cpp:104:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 104 | for(int j = 0; j < nodes.size(); j ++) { | ~~^~~~~~~~~~~~~~ main.cpp:83:38: warning: unused variable 'mod' [-Wunused-variable] 83 | long long cnt = pow1 / pow2, mod = 1; | ^~~