Compilare: main.cpp: In function 'ull exp(ull, ull)': main.cpp:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare] 22 | for(int i = 0; i < e; i++) p = p * b; | ~~^~~ main.cpp: In function 'int main()': main.cpp:79:20: warning: comparison of integer expressions of different signedness: 'std::stack<long long unsigned int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 79 | while(s.size() > n) s.pop(); | ~~~~~~~~~^~~