AME decided to destroy CH’s country. In CH’ country, There are N villages, which are numbered from 1 to N. We say two village A and B are connected, if and only if there is a road between A and B, or there exists a village C such that there is a road between
A and C, and C and B are connected. To defend the country from the attack of AME, CH has decided to build some roads between some villages. Let us say that two villages belong to the same garrison area if they are connected.
Now AME has already worked out the overall plan including which road and in which order would be attacked and destroyed. CH wants to know the number of garrison areas in his country after each of AME’s attack.
The first line contains two integers N and M — the number of villages and roads, (2 ≤ N ≤ 100000; 1 ≤ M ≤ 100000). Each of the next M lines contains two different integers u, v (1<=u, v<=N)—which means there is a road between u and v. The next line contains
an integer Q which denotes the quantity of roads AME wants to destroy (1 ≤ Q ≤ M). The last line contains a series of numbers each of which denoting a road as its order of appearance — different integers separated by spaces.
Output Q integers — the number of garrison areas in CH’s country after each of AME‘s attack. Each pair of numbers are separated by a single space.
#include<stdio.h>
const int N = 100005;
int fath[N],a[N],b[N],k[N],vist[N],ans;
int findroot(int x)
{
if(x!=fath[x])
fath[x]=findroot(fath[x]);
return fath[x];
}
void setroot(int x,int y)
{
x=findroot(x);
y=findroot(y);
if(x!=y)
{
fath[x]=y; ans--;
}
}
int main()
{
int q,n,m;
while(scanf("%d%d",&n,&m)>0)
{
for(int i=1;i<=n;i++)
fath[i]=i;
ans=n;
for(int i=1;i<=m;i++)
scanf("%d%d",&a[i],&b[i]),vist[i]=0;
scanf("%d",&q);
for(int i=1;i<=q;i++)
{
scanf("%d",&k[i]); vist[k[i]]=1;
}
for(int i=1;i<=m;i++)
if(vist[i]==0)
setroot(a[i],b[i]);
for(int i=q;i>0;i--)
{
int tt=k[i];
k[i]=ans;
setroot(a[tt],b[tt]);
}
for(int i=1;i<=q;i++)
{
printf("%d",k[i]);
if(i!=q)
printf(" ");
}
printf("\n");
}
}
/**************************************************************
Problem: 1601
User: aking2015
Language: C++
Result: Accepted
Time:352 ms
Memory:2916 kb
****************************************************************/
