vector中数据进行去重和排序

int a[] = {3, 2, 3, 5, 7, 5, 9 ,2};
std::vector<int> vec(a, a+sizeof(a)/sizeof(int) );
std::sort(vec.begin(), vec.end() );
vector<int>::iterator iter_end;
iter_end = std::unique(vec.begin(), vec.end() );
vec.erase(iter_end, vec.end() );