#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const ll INF=1e18+7;
void solve() {
    int n, m;
    cin >> n >> m;
    vector<ll>T(n), li(n);
    rep(i, n) cin >> T[i];
    vector<ll>V[n];
    vector<pair<ll,ll>>P;
    rep(i, m) {
        ll x, t;
        cin >> x >> t; --t;
        V[t].pb(x);
        P.pb({t, x});
    }
    rep(i, n) V[i].pb(INF);
    vector<ll>akt=T;
    set<pair<ll,ll>>q;
    rep(i, n) q.insert({V[i][0], i});
    ll l=0, ans=0;
    while(!q.empty()) {
        auto it=q.begin();
        auto a=*it;
        q.erase(it);
        ans+=akt[a.nd];
        akt[a.nd]=0;
        while(l<P.size() && P[l].st<=ans) {
            q.erase({V[P[l].nd][li[P[l].nd]], P[l].nd});
            ++li[P[l].nd];
            akt[P[l].nd]=T[P[l].nd];
            q.insert({V[P[l].nd][li[P[l].nd]], P[l].nd});
            ++l;
        }
    }
    cout << ans << '\n';
}
int main() {
	int _=1;
	cin >> _;
	while(_--) solve();
}