#include <bits/stdc++.h>
#define MAX 131072

using namespace std;
const int NMAX = 15010;

FILE *IN;

struct edges{
    int x, y, cost;
}edge[2 * NMAX];

int N, M, K;
int comp[NMAX], ans[NMAX];
bool use[NMAX];

vector <int> bucket[200];
pair <int, int> query[NMAX];

int pos, sign;
char f[MAX];

inline void Read(int &nr){
    sign = 0;
    nr = 0;
    while(f[pos] < '0' || f[pos] > '9'){
        if(f[pos] == '-') sign = 1;
        pos++;
        if(pos == MAX)
            fread(f, MAX, 1, IN), pos = 0;
    }
    while(f[pos] >= '0' && f[pos] <= '9'){
        nr = 10 * nr + f[pos++] - '0';
        if(pos == MAX)
            fread(f, MAX, 1, IN), pos = 0;
    }
    if(sign) nr =- nr;
}

inline bool cmp(edges a, edges b){
    return a.cost < b.cost;
}

void read(){
    Read(N); Read(M); Read(K);
    for(int i = 1; i <= M; i++){
        Read(edge[i].x);
        Read(edge[i].y);
        Read(edge[i].cost);
    }
    sort(edge + 1, edge + M + 1, cmp);
    for(int i = 1; i <= K; i++){
        Read(query[i].first);
        Read(query[i].second);
    }
}


inline int Find(int x){
    int root = x, aux;

    while(comp[root] != root)
        root = comp[root];

    while(x != root){
        aux = comp[x];
        comp[x] = root;
        x = aux;
    }

    return x;
}

inline void Union(int x, int y){
    comp[Find(x)] = Find(y);
}

void create_buckets(){
    int lim = sqrt(M) + 1, cnt = 1;
    for(int i = 1; i <= lim; i++){
        int k = i * lim;
        for(int j = cnt; j <= min(k, M); j++, cnt++)
            Union(edge[j].x, edge[j].y);
        for(int j = 1; j <= K; j++){
            if(Find(query[j].first) == Find(query[j].second) && !use[j]){
                use[j] = true;
                bucket[i].push_back(j);
            }
        }
    }
}

int main(){

    IN = fopen("radiatie.in", "r");
    freopen("radiatie.out", "w", stdout);

    read();

    for(int i = 1; i <= N; i++)
        comp[i] = i;
    create_buckets();
    for(int i = 1; i <= N; i++)
        comp[i] = i;
    for(int i = 1; i <= K; i++)
        use[i] = false;

    int lim = sqrt(M) + 1, cnt = 1;
    for(int i = 1; i <= lim; i++){
        int k = i * lim;
        for(int j = cnt; j <= min(k, M); j++, cnt++){
            Union(edge[j].x, edge[j].y);
            for(int l = 0; l < bucket[i].size(); l++)
                if(Find(query[bucket[i][l]].first) == Find(query[bucket[i][l]].second) && !use[bucket[i][l]])
                    ans[bucket[i][l]] = edge[j].cost, use[bucket[i][l]] = true;
        }
    }

    for(int i = 1; i <= K; i++)
        printf("%d\n", ans[i]);

    return 0;
}