题目描述
Problem D: Forests
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).
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 T and P followed by several lines, containing a pair of integers i and j, indicating that person i has heard tree j fall. People may have different opinions as to which trees, according to Berkeley, have made a sound. 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.
输入
暂无
输出
暂无
样例输入
3 4
1 2
3 3
1 3
2 2
3 2
2 4
样例输出
2
参考代码
int obs[200][200];
int done[200];
main()
{
int P,T,i,j=0,k,cnt=0;
scanf("%d%d",&P,&T);
while (2 == scanf("%d%d",&i,&j))
{
obs[i][j] = 1;
}
for (i=1;i<=P;i++)
{
if (done[i]) continue;
cnt++;
for (j=i;j<=P;j++)
{
for (k=1;k<=T && obs[i][k]==obs[j][k];k++);
if (k > T) done[j] = 1;
}
}
printf("%dn",cnt);
}
解析
暂无
