USACO section1.2 Milking Cows 挤牛奶（区间覆盖）

题目：http://www.wzoi.org/usaco/12%5C211.asp

 

额。。。。纠结了很久。。。。

开始没区别时间和时刻。。。。

区间是(star,end]都赋值为1

 

/*
ID: qiufeih1
PROG: milk2
LANG: C++
*/

#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

const int INF = 1<<30;

int a[1000001];

int main()
{
    freopen("milk2.in", "r", stdin);
    freopen("milk2.out", "w",stdout);
    int n;
    int star, end;
    int i, j;
    int ans1, ans2;
    int count;
    int flag;
    int min, max;
    scanf("%d", &n);
    min = INF;
    max = -1;
    memset(a, 0, sizeof(a));
    while (n--)
    {
        scanf("%d%d", &star, &end);
        for (i = star+1; i <= end; i++)//star+1。。。。。
        {
            a[i] = 1;
        }
        if (min > star+1)
        {
            min = star+1;
        }
        if (max < end)
        {
            max = end;
        }
    }

    ans1 = ans2 = 0;
    count = 1;

    for (i = min+1; i <= max; i++)
    {

        if (a[i] == a[i-1])
        {
            count++;
        }
        else
        {


            if (a[i-1])
            {
                if (ans1 < count)
                {
                    ans1 = count;
                }

            }
            else
            {
                if (ans2 < count)
                {
                    ans2 = count;
                }
            }
            count = 1;
        }
    }


    if (ans1 < count)
    {
        ans1 = count;
    }

    printf("%d %d\n", ans1, ans2);

    return 0;
}