LA 3644 X-Plosives
2014-05-18 15:24
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基础并查集
#include<bits/stdc++.h>
using namespace std;
int f[100020];
int ans;
int find(int x)
{
if(f[x]!=x)
f[x]=find(f[x]);
return f[x];
}
void make(int a,int b)
{
int f1=find(a);
int f2=find(b);
if(f1!=f2)
f[f2]=f1;
else
ans++;
}
int main()
{
int a,b;
while(scanf("%d",&a)==1)
{
ans=0;
for(int i=0;i<=100000;i++)
f[i]=i;
while(a!=-1)
{
scanf("%d",&b);
make(a,b);
scanf("%d",&a);
}
printf("%d\n",ans);
}
return 0;
}
#include<bits/stdc++.h>
using namespace std;
int f[100020];
int ans;
int find(int x)
{
if(f[x]!=x)
f[x]=find(f[x]);
return f[x];
}
void make(int a,int b)
{
int f1=find(a);
int f2=find(b);
if(f1!=f2)
f[f2]=f1;
else
ans++;
}
int main()
{
int a,b;
while(scanf("%d",&a)==1)
{
ans=0;
for(int i=0;i<=100000;i++)
f[i]=i;
while(a!=-1)
{
scanf("%d",&b);
make(a,b);
scanf("%d",&a);
}
printf("%d\n",ans);
}
return 0;
}
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