Pro2

原始文件为 CPP 代码，本文是转换后的 Markdown 文件。

#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <string>

using namespace std;

const int maxn = 2005;
const int maxtime = 1000005;

bool atime[maxtime];
bool btime[maxtime];

int main()
{
    //freopen("in.txt","r",stdin);
    memset(atime,false,sizeof(atime));
    memset(btime,false,sizeof(btime));

    int n,s,t;
    int uppertime = 0;
    scanf("%d",&n);

    for (int i = 0; i < n; ++i)
    {
        scanf("%d%d",&s,&t);
        if (t > uppertime) uppertime = t;   
        atime[s] = true;    
        while(++s < t)
            atime[s] = true;
    }

    for (int i = 0; i < n; ++i)
    {
        scanf("%d%d",&s,&t);    
        if (t > uppertime) uppertime = t;   
        btime[s] = true;
        while(++s < t)
            btime[s] = true;
    }

    int ans = 0;
    for (int i = 1; i <= uppertime; ++i)
    {
        if (atime[i] && btime[i])
            ++ans;          
    }

    printf("%d\n",ans);
}