WORK
Problem Description
It’s an interesting experience to move from ICPC to work, end my college life and start a brand new journey in company. As is known to all, every stuff in a company has a title, everyone except the boss has a direct leader, and all the relationship forms a tree. If A’s title is higher than B(A is the direct or indirect leader of B), we call it A manages B. Now, give you the relation of a company, can you calculate how many people manage k people.
Input There are multiple test cases. Each test case begins with two integers n and k, n indicates the number of stuff of the company. Each of the following n-1 lines has two integers A and B, means A is the direct leader of B.
1 <= n <= 100 , 0 <= k < n 1 <= A, B <= n
Output For each test case, output the answer as described above.
Sample Input 7 2 1 2 1 3 2 4 2 5 3 6 3 7
Sample Output 2
#include<cstdio> #define K 1011 int st[K]; int pa[K]; void find(int p) { while(p!=st[p]) { p=st[p]; pa[p]++; } } int main() { int n,m,i,a,b,ans; while(~scanf("%d%d",&n,&m)) { for(i=1;i<=n;i++) { st[i]=i; pa[i]=0; } for(i=1;i<n;i++) { scanf("%d%d",&a,&b); st[b]=a; } ans=0; for(i=1;i<=n;i++) { find(i); } for(i=1;i<=n;i++) { if(pa[i]==m) ans++; } printf("%d\n",ans); } return 0; }