HDOJ 1160 FatMouse's Speed 解题报告

    动态规划,最长上升子序列。看代码吧,可能更容易懂。

#include <iostream>
#include <algorithm>
using namespace std;

struct State
{
    int id;
    int weight;
    int speed;
    int pre;
    int num;
};

bool cmp(const State &a, const State &b)
{
    if(a.weight!=b.weight)
        return a.weight<b.weight;
    else
        return a.speed>b.speed;
}

void output(int x, State a[])
{
    if(a[x].num!=1)
        output(a[x].pre, a);
    cout<<a[x].id<<endl;
}

int main()
{
    State mouse[1001];
    int i,j,max=0,n=0;
    while(cin>>mouse[n].weight>>mouse[n].speed)
    {
        mouse[n].num=1;
        mouse[n].id=n+1;
        mouse[n].pre=0;
        n++;
    }

    sort(mouse,mouse+n,cmp);

    for(i=1;i<n;i++)
        for(j=0;j<i;j++)
            if((mouse[i].num<mouse[j].num+1) && (mouse[i].weight>mouse[j].weight) && (mouse[i].speed<mouse[j].speed))
            {
                mouse[i].num=mouse[j].num+1;
                mouse[i].pre=j;
                if(mouse[i].num>=mouse[max].num)
                    max=i;
            }

    cout<<mouse[max].num<<endl;
    output(max,mouse);
}

    一开始笔者也是不会做的,网上看了大牛的代码。。。然后自己试着去理解,再自己写的代码。嗯,貌似比看书强。做了数塔,Max Sum,还有这题,对于动态规划还是一知半解,还得继续努力啊^_^

posted @ 2013-02-04 16:21  SF-_-  阅读(168)  评论(0编辑  收藏  举报