Compilare: main.cpp: In function 'int main()': main.cpp:28:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i = 0; i + 1 < m[ind].size(); i++) | ~~~~~~^~~~~~~~~~~~~~~ main.cpp:29:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (int j = i + 1; j < m[ind].size(); j++) | ~~^~~~~~~~~~~~~~~