//Author: Kevin
#include<bits/stdc++.h>
//#pragma GCC optimize("O2")
using namespace std;
#define ll long long
#define ull unsigned ll
#define pb emplace_back
#define mp make_pair
#define ALL(x) (x).begin(),(x).end()
#define rALL(x) (x).rbegin(),(x).rend()
#define srt(x) sort(ALL(x))
#define rev(x) reverse(ALL(x))
#define rsrt(x) sort(rALL(x))
#define sz(x) (int)(x.size())
#define inf 0x3f3f3f3f
#define pii pair<int,int>
#define lb(v,x) (int)(lower_bound(ALL(v),x)-v.begin())
#define ub(v,x) (int)(upper_bound(ALL(v),x)-v.begin())
#define uni(v) v.resize(unique(ALL(v))-v.begin())
#define longer __int128_t
void die(string S){puts(S.c_str());exit(0);}
namespace domtree
{
	constexpr int MAX = 3e5 + 5;
	constexpr int INF = 0x5ffffff;

	struct E {
	int v, x;
	} e[MAX * 4];

	int n, m, tot, dfc;
	int ans[MAX], dfn[MAX], pos[MAX], sdm[MAX], idm[MAX], fa[MAX], mn[MAX],
		fth[MAX];
	int h[3][MAX * 2];

	void add(int x, int u, int v) {
	e[++tot] = {v, h[x][u]};
	h[x][u] = tot;
	}

	void dfs(int u) {
	dfn[u] = ++dfc;
	pos[dfc] = u;
	for (int i = h[0][u]; i; i = e[i].x) {
		int v = e[i].v;
		if (!dfn[v]) {
		dfs(v);
		fth[v] = u;
		}
	}
	}

	int find(int x) {
	if (fa[x] == x) {
		return x;
	}
	int tmp = fa[x];
	fa[x] = find(fa[x]);
	if (dfn[sdm[mn[tmp]]] < dfn[sdm[mn[x]]]) {
		mn[x] = mn[tmp];
	}
	return fa[x];
	}

	void tar(int st) {
	dfs(st);
	for (int i = 1; i <= n; ++i) {
		mn[i] = fa[i] = sdm[i] = i;
	}
	for (int i = dfc; i >= 2; --i) {
		int u = pos[i], res = INF;
		for (int j = h[1][u]; j; j = e[j].x) {
		int v = e[j].v;
		if (!dfn[v]) {
			continue;
		}
		find(v);
		if (dfn[v] < dfn[u]) {
			res = std::min(res, dfn[v]);
		} else {
			res = std::min(res, dfn[sdm[mn[v]]]);
		}
		}
		sdm[u] = pos[res];
		fa[u] = fth[u];
		add(2, sdm[u], u);
		u = fth[u];
		for (int j = h[2][u]; j; j = e[j].x) {
		int v = e[j].v;
		find(v);
		if (u == sdm[mn[v]]) {
			idm[v] = u;
		} else {
			idm[v] = mn[v];
		}
		}
		h[2][u] = 0;
	}
	for (int i = 2; i <= dfc; ++i) {
		int u = pos[i];
		if (idm[u] != sdm[u]) {
		idm[u] = idm[idm[u]];
		}
	}
	}

	void domtree(int _n,int _m,vector<pii> E)
	{
		tot=dfc=0;
		n=_n;
		m=_m;
		for(int i=0;i<=n+10;i++)
		{
			ans[i]=dfn[i]=pos[i]=0;
			mn[i]=idm[i]=sdm[i]=0;
			fa[i]=fth[i]=0;
		}
		for(int i=0;i<3;i++)
			for(int j=0;j<=n+n+10;j++)
				h[i][j]=0;
		for(auto pr:E)
		{
			add(0,pr.first,pr.second);
			add(1,pr.second,pr.first);
		}
		tar(1);
	}
}
ll c[100100];
int p[100100];
vector<int> G[100100];
ll ans[100100];
int siz[100100],son[100100],tp[100100],dfn[100100],ind[100100],tot;
void dfs1(int u)
{
	siz[u]=1;
	son[u]=0;
	tp[u]=0;
	for(auto v:G[u])
	{
		dfs1(v);
		siz[u]+=siz[v];
		if(siz[v]>siz[son[u]])
			son[u]=v;
	}
}
void dfs2(int u)
{
	if(!tp[u]) tp[u]=u;
	tot++;
	dfn[u]=tot;
	ind[tot]=u;
	if(son[u])
	{
		tp[son[u]]=tp[u];
		dfs2(son[u]);
	}
	for(auto v:G[u])
		if(v!=son[u])
			dfs2(v);
}
namespace segt
{
	#define ls (x<<1)
	#define rs (ls|1)
	ll c[100100<<2];
	ll mn1[100100<<2],mn2[100100<<2];
	ll mx[100100<<2],smx[100100<<2];
	ll add[100100<<2],addmx[100100<<2];
	void build(int x,int l,int r)
	{
		mx[x]=0;
		smx[x]=-1ll*inf*inf;
		mn1[x]=c[x];
		mn2[x]=1ll*inf*inf;
		add[x]=addmx[x]=0;
		if(l==r) return ;
		int mid=(l+r)/2;
		build(ls,l,mid);
		build(rs,mid+1,r);
	}
	void modify(int x,int l,int r,int p,ll vc)
	{
		if(l==r)
		{
			c[x]=vc;
			return ;
		}
		int mid=(l+r)/2;
		if(p<=mid) modify(ls,l,mid,p,vc);
		else modify(rs,mid+1,r,p,vc);
		c[x]=min(c[ls],c[rs]);
	}
	void pushdown(int x,int l,int r)
	{
		if(l!=r)
		{
			if(mx[ls]+addmx[ls]+add[ls]==mx[x])
				addmx[ls]+=addmx[x];
			if(mx[rs]+addmx[rs]+add[rs]==mx[x])
				addmx[rs]+=addmx[x];
			add[ls]+=add[x];
			add[rs]+=add[x];
		}
		mx[x]+=add[x];
		smx[x]+=add[x];
		mx[x]+=addmx[x];
		mn1[x]+=add[x]+addmx[x];
		mn2[x]+=add[x];
		add[x]=0;
		addmx[x]=0;
	}
	void pushup(int x,int l,int r)
	{
		int mid=(l+r)/2;
		pushdown(ls,l,mid);
		pushdown(rs,mid+1,r);
		mx[x]=max(mx[ls],mx[rs]);
		smx[x]=max(smx[ls],smx[rs]);
		mn1[x]=1ll*inf*inf;
		mn2[x]=min(mn2[ls],mn2[rs]);
		if(mx[ls]!=mx[x])
		{
			smx[x]=max(smx[x],mx[ls]);
			mn2[x]=min(mn2[x],mn1[ls]);
		}
		else
			mn1[x]=min(mn1[x],mn1[ls]);
		if(mx[rs]!=mx[x])
		{
			smx[x]=max(smx[x],mx[rs]);
			mn2[x]=min(mn2[x],mn1[rs]);
		}
		else
			mn1[x]=min(mn1[x],mn1[rs]);
	}
	void range_add(int x,int l,int r,int ql,int qr,ll v)
	{
		pushdown(x,l,r);
		if(ql<=l&&r<=qr)
		{
			add[x]+=v;
			return ;
		}
		int mid=(l+r)/2;
		if(ql<=mid) range_add(ls,l,mid,ql,qr,v);
		if(qr>mid) range_add(rs,mid+1,r,ql,qr,v);
		pushup(x,l,r);
	}
	void update(int x,int l,int r,int ql,int qr,ll v)
	{
		pushdown(x,l,r);
		if(v>=mx[x]) return ;
		if(ql<=l&&r<=qr)
		{
			if(v>smx[x])
			{
				addmx[x]+=v-mx[x];
				return ;
			}
			else
			{
				int mid=(l+r)/2;
				update(ls,l,mid,ql,qr,v);
				update(rs,mid+1,r,ql,qr,v);
				pushup(x,l,r);
				return ;
			}
		}
		int mid=(l+r)/2;
		if(ql<=mid) update(ls,l,mid,ql,qr,v);
		if(qr>mid) update(rs,mid+1,r,ql,qr,v);
		pushup(x,l,r);
	}
	ll query(int x,int l,int r,int ql,int qr)
	{
		pushdown(x,l,r);
		if(l==ql&&r==qr) return min(mn1[x],mn2[x]);
		int mid=(l+r)/2;
		if(qr<=mid) return query(ls,l,mid,ql,qr);
		if(ql>mid) return query(rs,mid+1,r,ql,qr);
		return min(query(ls,l,mid,ql,mid),query(rs,mid+1,r,mid+1,qr));
	}
	#undef ls
	#undef rs
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int t;
	cin>>t;
	while(t--)
	{
		int n,m,q;
		cin>>n>>m>>q;
		vector<pii> E;
		for(int i=1;i<=m;i++)
		{
			int u,v;
			cin>>u>>v;
			E.pb(v,u);
		}
		domtree::domtree(n,m,E);
		for(int i=1;i<=n;i++)
			cin>>c[i];
		for(int i=1;i<=n;i++)
			G[i].clear();
		for(int i=2;i<=n;i++)
		{
			p[i]=domtree::idm[i];
			G[p[i]].pb(i);
		}
		tot=0;
		dfs1(1);
		dfs2(1);
		for(int i=1;i<=n;i++)
			segt::modify(1,1,n,dfn[i],c[i]);
		segt::build(1,1,n);
		for(int i=1;i<=q;i++)
		{
			int u;
			ll cost;
			cin>>u>>cost;
			ans[i]=ans[i-1]+cost;
			int tmp=u;
			vector<pii> vec;
			while(tmp)
			{
				int L=dfn[tp[tmp]];
				int R=dfn[tmp];
				vec.pb(L,R);
				tmp=p[tp[tmp]];
			}
			srt(vec);
			for(auto pr:vec)
				ans[i]=min(ans[i],segt::query(1,1,n,pr.first,pr.second));
			int cur=1;
			for(auto pr:vec)
			{
				if(cur<pr.first)
					segt::range_add(1,1,n,cur,pr.first-1,cost);
				cur=pr.second+1;
			}
			if(cur<=n)
				segt::range_add(1,1,n,cur,n,cost);
			segt::update(1,1,n,1,n,ans[i]);
			cout<<ans[i]<<" ";
		}
		cout<<'\n';
	}
	return 0;
}