HDOJ 5821 Ball 贪心 (16多校day8 1001) )

该博客主要介绍了HDOJ 5821 Ball问题,通过贪心算法进行求解。博主分享了题目的链接、题意和解题思路,并给出了代码实现。

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题目链接:

http://acm.hdu.edu.cn/showproblem.php?pid=5821

https://vjudge.net/contest/180311#problem/J


题意:

给定数组a和数组b,长度为n,给定m组数据,每组数据两个数L和R ,代表从1开始计数的这两个数组的第L号位置到第R号位置期间的数可以重新排列,问经过m次的随机打乱可否由a数组变为b数组。
(观众:你 tm 这叫什么叙述,你高中上过语文课嘛!你怎么一点数学素养都没有。)

没看懂题意的可以参考这篇博客,捂脸逃

思路:

看了题解才明白,其实就是对于每次输入的数字,记录下在b数组里的位置,把每次的【L,R】的数字按照位置排序,就好啦。
嘛,哭晕在厕所。
两个致命错误:
1.没有彻底搞懂(说的好像你现在彻底搞懂了一样!)结构体的一些基本原理。
以 a[5].4 作为数字5在b数组的4号位的方式来存储,果断WA。
2.记录过的数字就不记录了,其实应该顺序记录,无论出没出现过都要记录。

6 1
1 4 4 0 3 2
0 4 2 4 1 3
× ×...
这种情况把数字 4 的位置都存为 2 就麻烦了。

改掉之后和AC代码对拍发现都对就是WA,WA两天后发现YES -> Yes抓狂

附:多校题解

上代码:

#include<cstdio>
#include<cstring>
#include <iostream>
#include <algorithm>
using namespace std;
#define N 1005
int b[N];
struct Node
{
    int x;
    int p;
    int ps;
} a[N];
int n;
int m;
int t;
bool compare(Node a,Node b)
{
    return a.p < b.p;
}
int main()
{
    int R = 0;
//    freopen("data.txt", "r", stdin);
//    freopen("outWA.txt", "w", stdout);
    scanf("%d", &t);
    while(t --)
    {
        int T;

        memset(a, 0, sizeof(a));
        memset(b, 0, sizeof(b));
        scanf("%d%d", &n, &m);
//        scanf("%d", &T);
        for(int i = 1; i <= n; i ++)
            scanf("%d", &a[i].x);
        for(int i = 1; i <= n; i ++)
        {
            scanf("%d", &b[i]);
            for(int j = 1; j <= n; j ++)
            {
                if(a[j].x == b[i] && a[j].p == 0)
                {
                    a[j].p = i;
                    break;
                }
            }
        }
        int l, r;
        for(int i = 1; i <= m; i ++)
        {

            scanf("%d%d", &l, &r);
            sort(a + l, a + l + (r - l + 1), compare);
        }
        int i;
        for(i = 1; i <= n; i ++)
        {
            if(a[i].x == b[i])
                ;
            else
                break;
        }
        if(i == n + 1)
            printf("Yes\n");
//            printf("Yes %d \n",R++);
        else
            printf("No\n");
//            printf("No(%d)\n", R++);
    }
}



做完发现这是道题说是什么贪心神题,还有什么颜色的情况:https://polebug.github.io/HDOJ-5821-Ball-16%E5%A4%9A%E6%A0%A1day8-1001/

跟颜色有什么关系,难道我读错题目了吗?没发现颜色的问题啊。。



                                                                                  完!

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