#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; }