#include "circuit.h"
#include <algorithm>
#include <bitset>
#include <cstdint>
#include <cstring>
#include <iostream>
#include <limits.h>
#include <math.h>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#define int long long
#define loop(X, N) for(int X = 0; X < (N); X++)
#define all(V) V.begin(), V.end()
#define rall(V) V.rbegin(), V.rend()
using namespace std;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<vector<ii>> vvii;
typedef vector<bool> vb;
typedef vector<vector<bool>> vvb;
int n, m;
vvi children;
vector<signed> assignment;
vi c;
int dfs(int node) { //a
if (node >= n) {
return { assignment[node] };
}
vii counts; //c, a
for (int child : children[node]) {
int res = dfs(node);
counts.push_back({c[child], res});
}
return counts[0].first * counts[1].second + counts[0].second * counts[1].first;
}
void cDfs(int node) {
if (node >= n) {
c[node] = 1;
}
c[node] = children[node].size();
for (int child : children[node]) {
cDfs(child);
c[node] *= c[child];
}
}
void init(signed N, signed M, std::vector<signed> P, std::vector<signed> A) {
n = N;
m = M;
children = vvi(n);
assignment = A;
c = vi(n + m);
for (int i = 1; i < n + m; i++) {
children[P[i]].push_back(i);
}
cDfs(0);
}
int count_ways(int L, int R) {
for (int i = L; i <= R; i++) {
assignment[i] ^= 1;
}
return dfs(0);
/*
3 children:
a =
1 * (a[0] * b[1] * b[2] + b[0] * a[1] * b[2] + b[0] * b[1] * a[2]) +
2 * (a[0] * a[1] * b[2] + a[0] * b[1] * a[2] + b[0] * a[1] * a[2]) +
3 * (a[0] * a[1] * a[2])
=
1 * (a[0] * (c[1] - a[1]) * (c[2] - a[2]))
2 * (a[0] * a[1] * (c[2] - a[2]))
3 * (a[0] * a[1] * a[2])
=
(1 + 2 - 3) * (a[0] * a[1] * a[2])
a[0] * c[1] * c[2]
2 * (a[0] * a[1] * c[2]) - 2 * (a[0] * a[1] * c[2])
C = c[0] * c[1] * c[2] * 3
b = C - a
=
2 children:
a =
1 * (a[0] * b[1] + b[0] * a[1]) +
2 * (a[0] * a[1])
=
1 * (a[0] * (c[1] - a[1]) + (c[0] - a[0]) * a[1]) +
2 * (a[0] * a[1])
= a[0] * c[1] + c[0] * a[1]
C = c[0] * c[1] * 2
b = C - a
=
*/
//return 0;
}
Compilation message
/usr/bin/ld: /tmp/ccEUqqpc.o: in function `main':
stub.cpp:(.text.startup+0x169): undefined reference to `count_ways(int, int)'
collect2: error: ld returned 1 exit status
