POJ 2419 Forests（模拟）

题目链接：

https://cn.vjudge.net/problem/POJ-2419

题目描述：

If a tree falls in the forest, and there's nobody there to hear, does it make a sound? This classic conundrum was coined by George Berkeley (1685-1753), the Bishop and influential Irish philosopher whose primary philosophical achievement is the advancement of what has come to be called subjective idealism. He wrote a number of works, of which the most widely-read are Treatise Concerning the Principles of Human Knowledge (1710) and Three Dialogues between Hylas and Philonous (1713) (Philonous, the "lover of the mind," representing Berkeley himself).

Input

A forest contains T trees numbered from 1 to T and P people numbered from 1 to P. Standard input consists of a line containing P and T followed by several lines, containing a pair of integers i and j, indicating that person i has heard tree j fall.

Output

People may have different opinions as to which trees, according to Berkeley, have made a sound. Output how many different opinions are represented in the input? Two people hold the same opinion only if they hear exactly the same set of trees. You may assume that P < 100 and T < 100.

Sample Input

Sample Output

 1 /*
 2 题意描述 
 3 有p个人去听t棵树倒下的声音，问有几种不同的观点数
 4 
 5 解题思路
 6 用二维数组记录i听到j倒下，如果某个人听到的结果和另一个完全相同，说明这两个人是一种观点，需要总观点数减一 
 7 */ 
 8 #include<cstdio>
 9 #include<cstring>
10 const int maxn=100+10;
11 
12 bool g[maxn][maxn];
13 int t,p;
14 int common(int a,int b);
15 
16 int main()
17 {
18     int x,y;
19     memset(g,0,sizeof(bool)*maxn*maxn);
20     scanf("%d%d",&p,&t);
21     while(scanf("%d%d",&x,&y) != EOF){
22         g[x][y]=1;
23     }
24     int sum=p;
25     for(int i=1;i<=p-1;i++){
26         for(int j=i+1;j<=p;j++){
27             if(common(i,j)){
28                 sum--;
29                 break;//遇到一个重复以后，总观点数减1后直接判断下一个 
30             }    
31         }
32     }
33     printf("%d\n",sum);
34     return 0;
35 } 
36 
37 int common(int a,int b)
38 {
39     for(int i=1;i<=t;i++){
40         if(g[a][i] != g[b][i])
41             return 0;
42     }
43     return 1;
44 }

POJ 2419 Forests（模拟）

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