Compilare: main.cpp: In function 'int main()': main.cpp:39:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | while (i < v[x].size() && j < v[y].size()) | ~~^~~~~~~~~~~~~ main.cpp:39:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | while (i < v[x].size() && j < v[y].size()) | ~~^~~~~~~~~~~~~