Compilare: main.cpp: In function 'bool ok(int)': main.cpp:22:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for (int i=0;i<v[acum].size();i++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for (int i=0;i<v[n].size();i++) | ~^~~~~~~~~~~~