Compilare: main.cpp: In function 'bool check(int)': main.cpp:16:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | if(x >= h[idx[1]].size()) return 0; | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:18:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | if(x >= h[idx[i]].size() || h[idx[1]][x] != h[idx[i]][x]) return 0; | ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int j = 1; j < s.size(); ++j) { | ~~^~~~~~~~~~