PAT1094:The Largest Generation
1094. The Largest Generation (25)
A family hierarchy is usually presented by a pedigree tree where all the nodes on the same level belong to the same generation. Your task is to find the generation with the largest population.
Input Specification:
Each input file contains one test case. Each case starts with two positive integers N (<100) which is the total number of family members in the tree (and hence assume that all the members are numbered from 01 to N), and M (<N) which is the number of family members who have children. Then M lines follow, each contains the information of a family member in the following format:
ID K ID[1] ID[2] ... ID[K]
where ID is a two-digit number representing a family member, K (>0) is the number of his/her children, followed by a sequence of two-digit ID's of his/her children. For the sake of simplicity, let us fix the root ID to be 01. All the numbers in a line are separated by a space.
Output Specification:
For each test case, print in one line the largest population number and the level of the corresponding generation. It is assumed that such a generation is unique, and the root level is defined to be 1.
Sample Input:
23 13
21 1 23
01 4 03 02 04 05
03 3 06 07 08
06 2 12 13
13 1 21
08 2 15 16
02 2 09 10
11 2 19 20
17 1 22
05 1 11
07 1 14
09 1 17
10 1 18
Sample Output:
9 4 思路
图的广搜(BFS),或者可以看成树的层次遍历。仔细看 输入数据 会发现结构很像图的邻接表,所以用vector<vector<int>>模拟一个图的邻接表。所以:
1.根据数据构造图graph。
2.用队列bfs,记录下孩子最多的一层和最多孩子数。(层次的区分可以依靠插入一个label到队列区分,每当一个label出队时,表示这一层遍历完,并且这一层所有节点的孩子都刚好加入队列等待遍历,所以label出队的同时再插入一个label可以将孩子所在的层级与孩子的孩子所在的层级区分开来)
3.输出记录即可。
代码
#include<iostream>
#include<vector>
#include<queue> //Need to be optimized
using namespace std;
int maxchild = ,level = ; void bfs(int root,const vector<vector<int>>& g)
{
int curlevel = ;
maxchild = ;
int countchild = ;
int label = -;
queue<int> q;
q.push(root);
q.push(label);
while(!q.empty())
{
int f = q.front();
q.pop();
if( f == label)
{
++curlevel;
if(maxchild < countchild)
{
level = curlevel;
maxchild = countchild;
}
countchild = ;
if(q.empty()) //检查下label是不是最后一层的label
break;
q.push(label);
}
else
{
countchild++;
for(int i = ;i < g[f].size();i++)
{
q.push(g[f][i]);
}
}
}
} int main()
{
int N,M;
while(cin >> N >> M)
{
//create graph
vector<vector<int>> graph(N + );
for(int i = ; i <=M;i++)
{
int node,childcount;
cin >> node >> childcount;
vector<int> childs(childcount);
for(int j = ;j < childcount;j++)
cin >> childs[j];
graph[node] = childs;
} bfs(,graph);
cout << maxchild << " " << level;
}
}
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