2014 Super Training #8 B Consecutive Blocks --排序+贪心

当时不知道怎么下手，后来一看原来就是排个序然后乱搞就行了。

解法不想写了，可见：http://blog.csdn.net/u013368721/article/details/28071241

其实就是滑动窗口的思想。

代码：

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <algorithm>
using namespace std;
#define N 100007
#define M 33

struct node
{
    int col,ind;
}p[N];

int cmp(node ka,node kb)
{
    if(ka.col == kb.col)
        return ka.ind < kb.ind;
    return ka.col < kb.col;
}

int main()
{
    int i,j,now,cnt,L;
    int n,m;
    while(scanf("%d%d",&n,&m)!=EOF)
    {
        for(i=1;i<=n;i++)
        {
            scanf("%d",&p[i].col);
            p[i].ind = i;
        }
        sort(p+1,p+n+1,cmp);
        L = 1;
        now = m;
        cnt = 1;
        int maxi = 1;
        for(i=2;i<=n;i++)
        {
            if(p[i].col == p[i-1].col)
            {
                now -= (p[i].ind-p[i-1].ind-1);
                cnt++;
                while(now < 0)  //滑动
                {
                    now += p[L+1].ind-p[L].ind-1;
                    cnt--;
                    L++;
                }
                maxi = max(maxi,cnt);
            }
            else
            {
                maxi = max(cnt,maxi);
                now = m;
                L = i;
                cnt = 1;
            }
        }
        maxi = max(maxi,cnt);
        printf("%d\n",maxi);
    }
    return 0;
}

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