Compilare: main.cpp: In function 'void perm(int, int, int)': main.cpp:18:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=0;i<v2.size() && v[v2[i]]+sum<=k;i++) | ~^~~~~~~~~~