#[allow(unused)]
use ac_library::*;
#[allow(unused)]
use itertools::Itertools;
#[allow(unused)]
use proconio::{marker::*, *};
#[allow(unused)]
use std::collections::*;

fn main() {
    input! {
        n: usize,
        m: usize,
        q: usize,
        a: [Usize1; n],
        mut uvw: [(Usize1, Usize1, i32); m],
    }
    if a.iter().enumerate().any(|(i, &a)| a != i) {
        panic!()
    }

    let mut ans = vec![-1; q];
    let mut b = std::iter::repeat_n(BinaryHeap::new(), n).collect::<Box<_>>();
    for i in 0..q {
        input! {
            s: Usize1,
            c: usize,
        }
        if c == 1 {
            ans[i] = 0;
        } else {
            b[s].push((!c, i));
        }
    }

    uvw.sort_unstable_by_key(|&(_, _, w)| w);
    let mut uf = Dsu::new(n);
    for (u, v, w) in uvw {
        let u = uf.leader(u);
        let v = uf.leader(v);
        if u == v {
            continue;
        }

        let z = uf.merge(u, v);
        let size = uf.size(z);

        let mut b1 = std::mem::take(&mut b[u]);
        let mut b2 = std::mem::take(&mut b[v]);
        // if b1.len() < b2.len() {
        std::mem::swap(&mut b1, &mut b2);
        // }
        b1.extend(b2);
        while let Some(&(c, i)) = b1.peek() {
            if !c > size {
                break;
            }
            b1.pop();
            ans[i] = w;
        }

        b[z] = b1;
    }

    for x in ans {
        println!("{x}");
    }
}