#include <bits/stdc++.h>
#include <atcoder/dsu>
using namespace std;
using ll = long long; 
#define rep(i, n) for (int i = 0; i < (n); i++)
template <class T> void dedup(vector<T>& a) {
	sort(a.begin(),a.end());
	a.erase(unique(a.begin(),a.end()),a.end());
}
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int N, M, Q;
	cin >> N >> M >> Q;
	vector<int> A(N);
	rep(i, N) cin >> A[i];
	vector<array<ll,3>> ES;
	rep(i, M) {
		int a, b, c;
		cin >> a >> b >> c;
		a--, b--;
		ES.push_back({c,a,b});
	}
	vector<int> V(Q), U(Q);
	rep(i, Q) {
		cin >> V[i] >> U[i];
		V[i]--;
	}
	vector<int>ANS(Q,-1);
	sort(ES.begin(),ES.end());
	atcoder::dsu uf(N);
	vector<vector<int>> S(N);
	rep(i, N) S[i].push_back(A[i]);
	rep(i,Q)if(U[i]==1)ANS[i]=0;
	auto Merge = [&](int w, int a, int b) {
		if (uf.same(a, b)) return;
		a = uf.leader(a), b = uf.leader(b);
		int n = uf.merge(a,b);
		int o = n ^ a ^ b;
		if (S[n].size() < S[o].size()) swap(S[n], S[o]);
		rep(i, S[o].size()) S[n].push_back(S[o][i]);
		dedup(S[n]);
	};
	for(auto[c,a,b]:ES) {
		Merge(c,a,b);
		rep(i,Q) {
			if(ANS[i]==-1) {
				int a = uf.leader(V[i]);
				if (S[a].size()>=U[i]) ANS[i]=c;
			}
		}
	}
	rep(i,Q)cout<<ANS[i]<<"\n";
}