页面置换算法LRU

Posted 2022-05-19 Keep--Silent

文章目录

• 说明
• 代码
• 测试数据
• • 输入
  • 输出

说明

LRU: least recently used
算法：单词查询修改O（n）

代码

#include <bits/stdc++.h>

using namespace std;
void print(vector<int> v)

    cout << "";
    for (auto t : v)
    
        if(t<0)break;
        cout << t << ",";
    
    cout << "";

int main()

    /*
    4
    2 0 2 9 3 4 2 8 2 4 8 4 5 
    4
    1 8 1 7 8 2 7 2 1 8 3 8 2 1 3 1 7 1 3 7
    */
    int n, x;
    cout << "输入页面数" << endl;
    cin >> n;
    vector<int> v(n, -1),v2;
    cout << "输入页号" << endl;
    while (cin >> x)
    
        cout<<x<<":";
        int flag=0;
        v2=v;
        for(auto &t:v)
            if(x==v[0])
                flag=1;
                break;
            
            swap(x,t);
            if(t<0)break;
        
        if(flag||x==v[0])cout<<"hit: ";
        else cout<<"miss: ";
        print(v2);
        cout<<"->";
        print(v);
        cout<<endl;
    
    return 0;

测试数据

输入

4
2 0 2 9 3 4 2 8 2 4 8 4 5

输出

输入页面数
    4
输入页号
    2 0 2 9 3 4 2 8 2 4 8 4 5
2:miss: ->2,
0:miss: 2,->0,2,
2:hit: 0,2,->2,0,
9:miss: 2,0,->9,2,0,
3:miss: 9,2,0,->3,9,2,0,
4:miss: 3,9,2,0,->4,3,9,2,
2:hit: 4,3,9,2,->2,4,3,9,
8:miss: 2,4,3,9,->8,2,4,3,
2:hit: 8,2,4,3,->2,8,4,3,
4:hit: 2,8,4,3,->4,2,8,3,
8:hit: 4,2,8,3,->8,4,2,3,
4:hit: 8,4,2,3,->4,8,2,3,
5:miss: 4,8,2,3,->5,4,8,2,

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