Compilare: main.cpp: In function 'int main()': main.cpp:50:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int i=0; i<lista[x].size(); i++) { | ~^~~~~~~~~~~~~~~~ main.cpp:85:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 85 | for(int j=0; j<lista[i].size()-1; j++) | ~^~~~~~~~~~~~~~~~~~