#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho
#include "gift.h"
using ll=long long;
using ld=long double;
int const INF=1000000005;
ll const LINF=1000000000000000005;
ll const mod=6700417;
ld const PI=3.14159265359;
ll const MAX_N=3e5+5;
ld const EPS=0.00000001;
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define endl '\n'
#define sz(a) (int)a.size()
#define CODE_START ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll pref[500005],cnt[500005];
int construct(int n, int r, std::vector<int> a, std::vector<int> b, std::vector<int> x) {
string ans="";
for(ll i=0;i<n;i++)
{
ans+='.';
}
for(ll i=0;i<r;i++){
if(x[i]==1){
pref[a[i]]++;
pref[b[i]+1]--;
}
}
for(ll i=0;i<n;i++){
if(i-1>=0){
pref[i]+=pref[i-1];
}
if(i-1>=0){
cnt[i]+=cnt[i-1];
}
if(pref[i]>=1){
ans[i]='R';
cnt[i]++;
}else {
ans[i]='B';
}
}
for(ll i=0;i<r;i++)
{
if(x[i]==2){
ll st=0;
if(a[i]-1>=0){
st=cnt[a[i]-1];
}
ll val=cnt[b[i]]-st;
if(val==b[i]-a[i]+1){
return 0;
}
if(val==0){
ans[a[i]]='R';
}
}
}
craft(ans);
return 1;
}
