02-线性结构3 Reversing Linked List(25 分)
2018-03-22 19:04
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02-线性结构3 Reversing Linked List(25 分)
Given a constant K and a singly linked list L, you are supposed to reverse the links of every K elements on L. For example, given L being 1→2→3→4→5→6, if K=3, then you must output 3→2→1→6→5→4; if K=4, you must output 4→3→2→1→5→6.Input Specification:
Each input file contains one test case. For each case, the first line contains the address of the first node, a positive N (≤105) which is the total number of nodes, and a positive K (≤N) which is the length of the sublist to be reversed. The address of a node is a 5-digit nonnegative integer, and NULL is represented by -1.Then N lines follow, each describes a node in the format:
Address Data Nextwhere
Addressis the position of the node,
Datais an integer, and
Nextis the position of the next node.
Output Specification:
For each case, output the resulting ordered linked list. Each node occupies a line, and is printed in the same format as in the input.Sample Input:
00100 6 4 00000 4 99999 00100 1 12309 68237 6 -1 33218 3 00000 99999 5 68237 12309 2 33218
Sample Output:
00000 4 33218 33218 3 12309 12309 2 00100 00100 1 99999 99999 5 68237 68237 6 -1
这道题想了好久,想出了一点头绪。关于翻转的部分还是看别人敲的代码才弄出来。
先说一下误区,
因为本题的输入的三个,而题目很明确的说了是让对链表进行翻转,所以自然而然想到了用一个结构体,结构体里定义三个变量,分别是当前地址,数值和下一个数字的地址。然后用结构数组+cmp+sort方法对结构体的数字按照从小到大进行排列。后来在实践中发现有问题,不仅表示的很麻烦,而且在后面的排序部分的cmp函数也很麻烦。
然后就又有一个想法,用当前的数字的值作为结构数组的下标,结构体里存放当前的地址和接下来next的地址
既然可以将data值作为数组下标,那么也可以将当前的地址值作为数组下标,结构体里存放当前的data值和next的地址
这个代码用的是后者+reverse函数 (头文件 #include <algorithm>)
#include <iostream>
#include <stdio.h>
#include <algorithm>
using namespace std;
const int maxn=1e6+15;
struct Node
{
int next;
int data;
}node[maxn+1];
int List[maxn+1];
int main()
{
int first,n,k;
int ddata,nnext,add;
cin>>first>>n>>k;
int p=first;
for(int i=0; i<n; i++)
{
cin>>add>>ddata>>nnext;
node[add].data=ddata;
node[add].next=nnext;
}
int j=0;
while(p!=-1)
{
List[j++]=p;
p=node[p].next;
}
int i=0;
while((i+k)<=j)
{
reverse(&List[i],&List[i+k]);
i=i+k;
}
for(int i=0; i<j-1; i++)
printf("%05d %d %05d\n",List[i],node[List[i]].data,List[i+1]);
printf("%05d %d -1\n",List[j-1],node[List[j-1]].data);
return 0;
}
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