#include <fstream>
#include <vector>
#include <queue>
#include <functional>
#define M 2000000000
using namespace std;
ifstream fin("radiatie.in");
ofstream fout("radiatie.out");
int n, m, k, x, y, c, viz[15010], grad[15010], i;
struct tata
{
    int c, nod;
}t[15010];
vector < pair < int, int > > g[30010];
priority_queue < pair < int, int >, vector < pair < int, int > >, greater < pair < int, int > > > qu;
void apm()
{
    for(int j = 2; j <= n; j++)
    {
        t[j].c = M;
    }
    qu.push({0, 1});
    while(!qu.empty())
    {
        int nod = qu.top().second;
        qu.pop();
        if(viz[nod] == 0)
        {
            viz[nod] = 1;
            for(int i = 0; i < g[nod].size(); i++)
            {
                if(t[g[nod][i].first].c > t[nod].c + g[nod][i].second)
                {
                    t[g[nod][i].first].c = t[nod].c + g[nod][i].second;
                    t[g[nod][i].first].nod = nod;
                    grad[g[nod][i].first] = grad[nod] + 1;
                }
                if(viz[g[nod][i].first] == 0)
                    qu.push({t[g[nod][i].first].c, g[nod][i].first});
            }
        }
    }

}
int drum(int x, int y)
{
    int Max = 0;
    while(t[x].nod != y)
    {
        if(t[x].c > Max)
            Max = t[x].c;
        x = t[x].nod;
    }
    return Max;
}
int main()
{
    fin >> n >> m >> k;
    for(i = 1; i <= m; i++)
    {
        fin >> x >> y >> c;
        g[x].push_back({y, c});
        g[y].push_back({x, c});
    }
    apm();
//    for(i = 1; i <= n; i++)
//    {
//        fout <<i << " "<< grad[i]<< " " << t[i].nod << " "<<t[i].c <<'\n';
//    }
    for(i = 1; i <= k; i++)
    {
        fin >> x >> y;
        if(grad[x] > grad[y])
            fout << drum(x, y);
        else
            fout << drum(y, x);
        fout << '\n';
    }
    return 0;
}