POJ-2367 Genealogical tree 【拓扑模板题】

F - Genealogical tree

Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%lld & %llu
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Status
Description
The system of Martians’ blood relations is confusing enough. Actually, Martians bud when they want and where they want. They gather together in different groups, so that a Martian can have one parent as well as ten. Nobody will be surprised by a hundred of children. Martians have got used to this and their style of life seems to them natural.
And in the Planetary Council the confusing genealogical system leads to some embarrassment. There meet the worthiest of Martians, and therefore in order to offend nobody in all of the discussions it is used first to give the floor to the old Martians, than to the younger ones and only than to the most young childless assessors. However, the maintenance of this order really is not a trivial task. Not always Martian knows all of his parents (and there’s nothing to tell about his grandparents!). But if by a mistake first speak a grandson and only than his young appearing great-grandfather, this is a real scandal.
Your task is to write a program, which would define once and for all, an order that would guarantee that every member of the Council takes the floor earlier than each of his descendants.
Input
The first line of the standard input contains an only number N, 1 <= N <= 100 — a number of members of the Martian Planetary Council. According to the centuries-old tradition members of the Council are enumerated with the natural numbers from 1 up to N. Further, there are exactly N lines, moreover, the I-th line contains a list of I-th member’s children. The list of children is a sequence of serial numbers of children in a arbitrary order separated by spaces. The list of children may be empty. The list (even if it is empty) ends with 0.
Output
The standard output should contain in its only line a sequence of speakers’ numbers, separated by spaces. If several sequences satisfy the conditions of the problem, you are to write to the standard output any of them. At least one such sequence always exists.
Sample Input
5
0
4 5 1 0
1 0
5 3 0
3 0
Sample Output
2 4 5 3 1

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1. 题描述了一种火星人的血缘关系，直接看数据吧：5代表有几个人（编号1-5），下面5行：第i行表示第i个人的儿子都有谁，每一行0代表结束。求出序列父亲在前，儿子在后。
2. 思路： 每个人都是一个点，关系是边，将信息转化成图，用拓扑排序求出序列。
3. 失误：应注意区分图的两种存储方式的不同。
4. 代码如下：

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邻接矩阵：

#include<cstdio>#include<cstring>#include<queue>using namespace std;const int MAXN=1e3+10;int map[MAXN][MAXN],ideg[MAXN],ord[MAXN];void topo(int n){     for(int i=1;i<=n;++i)     {        int k;        for(int j=1;j<=n;++j)        {             if(!ideg[j])             {                 ideg[j]=-1; k=j;                 break;              }         }         ord[i]=k;         for(int j=1;j<=n;++j)         {            if(ideg[j]>0&&map[k][j])            {                --ideg[j];             }         }     }}int main(){       int n,i,v;    while(~scanf("%d",&n))    {        memset(map,0,sizeof(map)); memset(ideg,0,sizeof(ideg));        for(i=1;i<=n;++i)        {            while(scanf("%d",&v),v)            {                if(!map[i][v])//注意临界矩阵和邻接表的区别                {                    map[i][v]=1; ++ideg[v];                }            }        }        topo(n);        for(i=1;i<=n;++i)        {            if(i>1) printf(" ");            printf("%d",ord[i]);        }        printf("\n");    }    return 0; }