Compilare: main.cpp: In function 'bool check(std::vector<sigma>&, long long int)': main.cpp:26:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<sigma>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int i=0;i < a.size() && ook;i++){ | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<sigma>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for(int i=0;i < a.size();i++){ | ~~^~~~~~~~~~