Compilare: main.cpp: In function 'bool is_valid(std::vector<long long int>&)': main.cpp:10:34: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | #define rep(i,n) for(int i = 0; i<n;i++) ...... 28 | rep(i, v.size()) | ~~~~~~~~~~~ main.cpp:28:5: note: in expansion of macro 'rep' 28 | rep(i, v.size()) | ^~~ main.cpp: In function 'int main()': main.cpp:48:9: warning: unused variable 'count' [-Wunused-variable] 48 | int count = 0; | ^~~~~