// LRU.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <iostream>#include <queue>#include<vector>using namespace std;void LRU(){    vector<int> v;    cout << "Input Array Length" << endl;    int L1 = 0;    int n = 0;    int pos = 0;    cin >> L1;    cout << "Input Page Change Order" << endl;    while (~scanf("%d",&n))    {        if (v.size() < 3)        {            int pos = 0;            for (int i = 0;i<v.size();i++)            {                if (v[i] == n)                {                    //flag = true;                    pos = i;                    std::vector<int>::iterator it = v.begin()+pos;                    v.erase(it);                }            }            v.push_back(n);        }        else         {            bool flag = false;            int pos = 0;            for (int i = 0;i<v.size();i++)            {                if (v[i] == n)                {                    flag = true;                    pos = i;                }            }            if (flag)            {                std::vector<int>::iterator it = v.begin()+pos;                v.erase(it);                v.push_back(n);            }            else            {                v.erase(v.begin());                v.push_back(n);            }        }        for (int i = 0;i<v.size();i++)        {            cout << v[i] << " ";        }        cout << endl;    }}int main(int argc, char* argv[]){    //printf("Hello World!\n");    LRU();    return 0;}