Compilare: main.cpp: In function 'bool check(int)': main.cpp:10:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for( i = 1; i < v.size(); i++ ){ | ~~^~~~~~~~~~ main.cpp:12:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | if( poz >= pref[v[i]].size() || pref[v[i]][poz] != pref[v[0]][poz] ){ | ~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for( j = 0; j < s.size(); j++ ){ | ~~^~~~~~~~~~