#include<fstream>
#include<iostream>
#include<algorithm>
using namespace std;
int n,m,a[5001][5001],a2[5001][5001],viz[5001],v[5001],k;
int rec(int z,int x,int nr)
{
	int i;
	//cout<<x<<" "<<nr<<'\n';
	a2[z][x]=nr;
	for(i=1;i<=n;i++)
		if(a[x][i] && !viz[i] && a2[z][i]>max(a2[z][x],a[x][i]))
		{
			viz[i]=1;
			rec(z,i,max(a2[z][x],a[x][i]));
			viz[i]=0;
		}
}

int main()
{
	int i,j,xx,yy,cc;
	ifstream f("radiatie.in");
	ofstream g("radiatie.out");
	f>>n>>m>>k;
	for(i=1;i<=m;i++)
	{
		f>>xx>>yy>>cc;
		a[xx][yy]=a[yy][xx]=cc;
	}
	
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			a2[i][j]=320000;
	
	for(i=1;i<=k;i++)
	{
		f>>xx>>yy;
		if(!v[xx])
		{
			viz[xx]=1;
			rec(xx,xx,0);
			viz[xx]=0;
			g<<a2[xx][yy]<<'\n';
			v[xx]=1;
		}
		else g<<a2[xx][yy]<<'\n';
	}
	

		
}