Compilare: main.cpp: In function 'bool check(int)': main.cpp:17:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | if (nr>v[i].size()) return false; | ~~^~~~~~~~~~~~ main.cpp:24:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (int k=nr;k<v[i].size();k++) { | ~^~~~~~~~~~~~ main.cpp:31:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long unsigned int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int i=0;i<array[0].size();i++) { | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (int j=0;j<s.size();j++) | ~^~~~~~~~~