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#include <bits/stdc++.h>
#define all(vec) vec.begin(),vec.end()
#define pb push_back
#define EB emplace_back
#define EM emplace
#define FI first
#define SE second
#define pct __builtin_popcountll
#define ctz __builtin_ctzll
#define SZ(a) ((int) a.size())
#define FOR(i, a, b) for (long long i = (a); i <= (b); ++i)
#define ROF(i, a, b) for (long long i = (a); i >= (b); --i)
#define debug(var) cerr << #var <<":"<<var<<"\n";
#define cend cerr<<"\n-----------\n"
#define lson(var) (var<<1)
#define rson(var) ((var<<1)+1)
#define fsp(x) fixed<<setprecision(x)
using namespace std;
using ll = long long;using ull = unsigned long long;
using DB=double;using LD=long double;
using pdd = pair<DB,DB>;using plb = pair<ll,bool>;
using pll = pair<ll,ll>;using vll=vector<ll>;using vb=vector<bool>;
using vdb = vector<DB>;
using tll = tuple<ll,ll,ll>;
using vpll = vector<pll>;using vtll = vector<tll>;
using arr3 = array<ll,3> ;using arr2 = array<ll,2>;
constexpr ll MAXN=(ll)1e6+10,INF=(ll)1e17+9;
constexpr ll mod=(ll)1e9+7;
constexpr double eps=1e-8;const double pi=acos(-1.0);
ll N,M,Q,X,K,T,lT;
inline void __();
signed main()
{
ios::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
cin>>lT;
while(lT--)
__();
return 0;
}
inline void __(){
cin>>N>>M;
vpll lr;
vector<char> S(2*N+5);
vll A(2*N+5);
bool isN=false;
FOR(i,0,M-1){
ll l,r;
cin>>l>>r;
if(l!=1){
lr.EB(l,r);
}
if(l==2*N){
isN=true;
}
}
if(isN){
cout<<-1<<"\n";
return;
}
sort(all(lr),greater<>());
vpll llr;
if(!lr.empty()){
ll l=lr[0].FI,r=lr[0].SE;
FOR(i,1,SZ(lr)-1){
ll ll=max(l,lr[i].FI),rr=min(r,lr[i].SE);
if(ll>rr){
llr.EB(l,r);
l=lr[i].FI;r=lr[i].SE;
}else{
l=ll;
r=rr;
}
}
llr.EB(l,r);
}
S[1]='(';A[1]=1;
FOR(i,0,SZ(llr)-1){
S[llr[i].FI]='(';
A[llr[i].FI]=1;
}
vll Sum(2*N+5);
FOR(i,1,2*N){
if(A[i]==0){
A[i]=-1;
}
Sum[i]=Sum[i-1]+A[i];
}
ll N2=2*N;
#ifdef LOCAL
FOR(i,1,N2){
cerr<<Sum[i]<<" ";
}
cerr<<"\n";
FOR(i,0,SZ(llr)-1){
debug(llr[i].FI);
debug(llr[i].SE);
}
#endif
if(Sum[2*N]>0){
cout<<-1<<"\n";
return;
}
ll sum=Sum[N2];
FOR(i,1,N2){
if(S[i]!='('){
if(sum<0){
sum+=2;
S[i]='(';
}else{
S[i]=')';
}
}
}
sum=0;
FOR(i,1,N2){
if(S[i]=='('){
sum+=1;
}else{
sum-=1;
}
if(sum<0){
cout<<-1<<"\n";
return;
}
}
FOR(i,1,N2){
cout<<S[i];
}
cout<<"\n";
}
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