unordered_multiset_name.clear()

//C++程序，说明unordered_multiset::clear()函数
#include <bits/stdc++.h>
using namespace std;

int main()
{
    //声明
    unordered_multiset<int> sample;

    //插入元素
    sample.insert(11);
    sample.insert(11);
    sample.insert(11);
    sample.insert(12);
    sample.insert(13);
    sample.insert(13);
    sample.insert(14);

    cout << "元素: ";

    for (auto it = sample.begin(); it！= sample.end(); it++) {
        cout << *it << " ";
    }

    sample.clear();

    cout << "\n函数调用后容器大小: " 
          << sample.size();

    return 0;
}

元素: 14 11 11 11 12 13 13 
函数调用后容器大小: 0

//C++程序，说明unordered_multiset::clear()函数
#include <bits/stdc++.h>
using namespace std;

int main()
{
    //声明
    unordered_multiset<int> sample;

    //插入元素
    sample.insert(1);
    sample.insert(1);
    sample.insert(1);
    sample.insert(2);
    sample.insert(3);
    sample.insert(4);
    sample.insert(3);

    cout << "元素: ";

    for (auto it = sample.begin(); it！= sample.end(); it++) {
        cout << *it << " ";
    }

    sample.clear();

    cout << "\n函数调用后容器大小: " 
          << sample.size();

    return 0;
}

元素: 1 1 1 2 3 3 4 
函数调用后容器大小: 0