#include "gift.h"
#include <bits/stdc++.h>
using namespace std;
vector<tuple<int,int,int>> v;
int A[500005];
int qs[500005];
bool same[500005];
int construct(int n, int r, vector<int> a, vector<int> b, vector<int> x) {
for (int i = 0; i < r; i++) {
a[i]++; b[i]++;
if (x[i] == 1) {
A[a[i]]++;
A[b[i] + 1]--;
}
}
for (int i = 1; i <= n; i++) {
A[i] += A[i - 1];
if (A[i] > 0) {
same[i] = true;
}
}
bool prev = false;
for (int i = 1; i <= n; i++) {
if (prev == 1 && same[i] == 1) {
qs[i] = qs[i - 1];
} else {
qs[i] = (qs[i - 1] + 1) % 2;
}
prev = same[i];
}
for (int i = 1; i <= n; i++) {
qs[i] += qs[i - 1];
}
for (int i = 0; i < r; i++) {
if (x[i] == 1) continue;
if (qs[b[i]] - qs[a[i] - 1] == b[i] - a[i] + 1 || qs[b[i]] - qs[a[i] - 1] == 0) return 0;
}
string S = "";
for (int i = 1; i <= n; i++) {
int d = qs[i] - qs[i - 1];
if (d == 1) S += 'R';
else S += 'B';
}
craft(S);
return 1;
}
