/**
* author: m371
* created: 07.11.2021 10:35:40
**/
#include "gift.h"
#include <bits/stdc++.h>
using namespace std;
class dsu {
public:
vector<int> p;
int n;
dsu(int _n) : n(_n) {
p.resize(n);
iota(p.begin(), p.end(), 0);
}
inline int get(int x) {
return (x == p[x] ? x : (p[x] = get(p[x])));
}
inline bool unite(int x, int y) {
x = get(x);
y = get(y);
if (x != y) {
p[x] = y;
return true;
}
return false;
}
};
int construct(int n, int r, vector<int> a, vector<int> b, vector<int> x) {
dsu d(n);
for (int i = 0; i < r; i++) {
if (x[i] == 1) {
int j = d.get(a[i]);
while (j <= b[i] && d.get(j) != d.get(b[i])) {
d.unite(j, b[i]);
j = d.get(j + 1);
}
}
}
for (int i = 0; i < r; i++) {
if (x[i] == 2) {
if (d.get(a[i]) == d.get(b[i])) {
return 0;
}
}
}
string ans = "R";
for (int i = 1; i < n; i++) {
if (d.get(i) != d.get(i - 1)) {
ans += (ans.back() ^ 'R' ^ 'B');
} else {
ans += ans.back();
}
}
craft(ans);
return 1;
}
