[洛谷] P1204 挤牛奶

贪心 线段重合

求最大重叠段长度

和最大间距

//#pragma GCC optimize(2)
#include <cstdio>
#include <iostream>
#include <cstdlib>
#include <cmath>
#include <cctype>
#include <string>
#include <cstring>
#include <algorithm>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <ctime>
#include <vector>
#include <fstream>
#include <list>
#include <iomanip>
#include <numeric>
using namespace std;
typedef long long ll;

const int MAXN = 1e6 + 10;

ll ra = 0, rb = 0;

struct node
{
    ll fst, lst;
}arr[MAXN];

bool cmp(node a, node b)
{
    if(a.fst != b.fst)
        return a.fst < b.fst;
    return a.lst ;
}

int main()
{
    //ios::sync_with_stdio(false);

    //cin.tie(0);     cout.tie(0);

    int T;

    cin>>T;

    for(int i = 0; i < T; i++)
        cin>>arr[i].fst>>arr[i].lst;

    sort(arr, arr + T, cmp);

    /*printf("\n");

    for(int i = 0; i < T; i++)
        cout<<arr[i].fst<<' '<<arr[i].lst<<endl;*/

    ll linkfst = arr[0].fst, linklst = arr[0].lst;

    ra = max(ra, linklst - linkfst);

    for(int i = 1; i < T; i++)
    {
        if(arr[i].lst > linklst && arr[i].fst <= linklst)
        {
            linklst = arr[i].lst;
            ra = max(ra, linklst - linkfst);
        }
        else if(arr[i].fst > linklst)
        {
            rb = max(rb, arr[i].fst - linklst);

            linkfst = arr[i].fst, linklst = arr[i].lst;

            ra = max(ra, linklst - linkfst);
        }
        
    }

    //printf("\n");
    
    cout<<ra<<' '<<rb<<endl;


    return 0;
}