链表_A1052 Linked List Sorting (25 分)

https://pintia.cn/problem-sets/994805342720868352/problems/994805425780670464

/*
*链表的处理
*1.定义静态链表，结构体数组
*2.初始化falg为false
*3.从链表首地址begin遍历，并标记有效结点
*4.对结点排序，有效结点true大于false
*/
#include<iostream>
using namespace std;
#include<cstdio>
#include<algorithm>
const int MAXN=100010;

struct Node {
    int address,data,next;
    bool falg;
}node[MAXN];

bool cmp(Node a,Node b) { //函数cmp为bool类型，参数为Node
    if(a.falg==false || b.falg==false) {
        return a.falg>b.falg; //把无效结点往后放
    }else {
        return a.data<b.data;
    }
}

int main() {
    for(int i=0;i<MAXN;i++) {
        node[i].falg=false;
    }
    int num,begins,address;
    scanf("%d%d",&num,&begins);
    for(int i=0;i<num;i++) {
        scanf("%d",&address); //先读入地址
        scanf("%d%d",&node[address].data,&node[address].next);
        node[address].address=address;
    }
    int counts=0,point=begins;
    while(point != -1) {
        node[point].falg=true;
        counts++;
        point=node[point].next;
    }
    if(counts==0) { //特判，新链表没有结点时输出0 -1
        printf("0 -1");
    }else {
        sort(node,node+MAXN,cmp);
        printf("%d %05d\n",counts,node[0].address);
        for(int i=0;i<counts;i++) {
            if(i != counts-1) {
                //结点地址node[i],node[i+1]
                printf("%05d %d %05d\n",node[i].address,node[i].data,node[i+1].address);
            }else {
                printf("%05d %d -1\n",node[i].address,node[i].data);
            }
        }
    }
    return 0;
}