Compilare: main.cpp: In function 'int main()': main.cpp:51:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i = 0; i < v[vr].size(); i++){ | ~~^~~~~~~~~~~~~~ main.cpp:71:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for(int i = 0; i < v[vr].size(); i++){ | ~~^~~~~~~~~~~~~~ main.cpp:39:9: warning: unused variable 'it' [-Wunused-variable] 39 | int it = 0; | ^~