usaco 2.3.5concom

/*{
ID:jzy3209981
PROG:concom
LANG:C++
}*/
#include<stdio.h>
#include<iostream>
#include<string.h>
#include<math.h>
using namespace std;
int control[101][101];
int state[101][101];
int sum[101];
int main()
{
freopen ("concom.in","r",stdin);
freopen ("concom.out","w",stdout);
int n,i,first,second,percent,j,k,sign=0;
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d%d%d",&first,&second,&percent);
state[first][first]=1;
if(percent>50)
state[first][second]=1;
control[first][second]=percent;
}
while(sign==0)
{
sign=1;
for(i=1;i<=100;i++)
{
memset(sum,0,sizeof(sum));
for(j=1;j<=100;j++)
{
if(state[i][j]==1)
{
for(k=1;k<=100;k++)
sum[k]+=control[j][k];
}
}
for(j=1;j<=100;j++)
{
if(sum[j]>50&&state[i][j]!=1)
{
sign=0;
state[i][j]=1;
}
}
}
}
for(i=1;i<=100;i++)
for(j=1;j<=100;j++)
if(state[i][j]==1&&i!=j)
printf("%d %d\n",i,j);
return 0;
}