This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include "circuit.h"
typedef long long int64;
using namespace std;
const int64 mod = 1000002022;
const int maxn = 2e3 + 2;
vector <int> ad [maxn];
int64 dp[maxn][2];
int n,m;
void init(int N, int M, vector<int> P, vector<int> A) {
n = N, m = M;
for (int i = 1; i < N + M; i++){
ad[P[i]].push_back(i);
}
for (int i = 0; i < M; i++){
dp[N+i][A[i]] = 1;
}
}
void build (int x) {
if (x > n) return;
int l = ad[x][0], r = ad[x][1];
build(l); build(r);
dp[x][0] = ((dp[l][0] * dp[r][0] * 2 % mod) + (dp[l][0] * dp[r][1] % mod) + (dp[l][1] * dp[r][0] % mod)) % mod;
dp[x][1] = ((dp[l][1] * dp[r][1] * 2 % mod) + (dp[l][0] * dp[r][1] % mod) + (dp[l][1] * dp[r][0] % mod)) % mod;
}
int count_ways(int L, int R) {
for (int i = L; i <= R; i++){
swap(dp[n+i][0], dp[n+i][1]);
}
build(0);
return dp[0][1];
}
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