CodeForces 22C System Administrator
把v和2结点交换,
1和v连,其它点和v之间能够互相连。
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <string>
#include <cstdio>
#include <cmath>
#include <algorithm>
using namespace std; int n,m,v,flag,i,cnt,j; int main()
{
while(~scanf("%d%d%d",&n,&m,&v))
{
flag=0;
if((n-1)*(n-2)/2+1<m) flag=1;
if(m<n-1) flag=1;
if(flag)
{
printf("-1\n");
continue;
}
cnt=n-1;
for(i=1;i<n;i++)
{
if(i==2) printf("%d ",v);
else if(i==v) printf("%d ",2);
else printf("%d ",i);
if(i+1==2) printf("%d\n",v);
else if(i+1==v) printf("%d\n",2);
else printf("%d\n",i+1);
}
for(i=2;i<n&&cnt!=m;i++)
{
for(j=i+2;j<=n&&cnt!=m;j++)
{
cnt++;
if(i==2) printf("%d ",v);
else if(i==v) printf("%d ",2);
else printf("%d ",i);
if(j==2) printf("%d\n",v);
else if(j==v) printf("%d\n",2);
else printf("%d\n",j);
}
}
}
return 0;
}
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