#include <bits/stdc++.h>

using namespace std;

int main() {
    vector<int> v = {1, 1, 2, 4, 5, 5, 6, 7, 8, 8};
    sort(v.begin(), v.end());
    // 把v中重复的元素放到p迭代器的后边
    auto p = unique(v.begin(), v.end());
    v.erase(p, v.end());
    return 0;
}