#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 2e5+10;
struct chong{
    int dis;
    int x;
    bool operator < (const chong &b) const{
        return dis < b.dis;
    }
}chg[maxn];
int a[maxn];
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t;
    cin>>t;
    while(t--){
        int n,m;
        cin>>n>>m;
        int ans = 0;
        for(int i = 1;i<=n;i++){
            cin>>a[i];
            ans += a[i];
        }
        for(int i = 1;i<=m;i++){
            cin>>chg[i].dis>>chg[i].x;
        }
        sort(chg+1,chg+m+1);
        int di = 0;
        int add = 0;
        for(int i = 1;i<=m&&ans+add>=chg[i].dis;i++){
            int dis = chg[i].dis;
            int x= chg[i].x;
            //cout<<dis<<" "<<x<<" "<<a[x]<<endl;
            if(dis - di > a[x]){
                di += a[i];
                add += a[i];
                //cout<<di<<" "<<add<<endl;
            }
            else{
                add += dis - di;
                di = dis;
            }
            //cout<<di<<" "<<add<<endl;
        }
        cout<<ans+add<<endl;
    }
    
}