Submission #757127

#	Time	Username	Problem	Language	Result	Execution time	Memory
757127		boris_mihov	Digital Circuit (IOI22_circuit)	C++17	2 / 100	3072 ms	7928 KiB

circuit

#include "circuit.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <vector>
 
typedef long long llong;
const int MAXN = 200000 + 10;
const int MOD = 1000002022;
const int INF = 1e9;
 
int n, m;
llong w[MAXN];
llong b[MAXN];
llong pw[MAXN];
std::vector <int> g[MAXN];

void initDFS(int node)
{
    if (g[node].empty())
    {
        pw[node] = 1;
        return;
    }
    
    pw[node] = g[node].size();
    for (const int &i : g[node])
    {
        initDFS(i);
        pw[node] *= pw[i];
        pw[node] %= MOD;
    }
}

void init(int N, int M, std::vector <int> P, std::vector <int> A) 
{
    n = N;
    m = M;
    for (int i = 1 ; i < n + m ; ++i)
    {
        g[P[i] + 1].push_back(i + 1);
    }
 
    for (int i = n + 1 ; i <= n + m ; ++i)
    {
        if (A[i - n - 1] == 0)
        {
            w[i] = 1;
            b[i] = 0;
        } else
        {
            b[i] = 1;
            w[i] = 0;
        }
    }

    initDFS(1);
}
 
void dfs(int node)
{
    if (g[node].empty())
    {
        return;
    }
 
    b[node] = 0;
    for (const int &i : g[node])
    {
        dfs(i);
        b[node] += 1LL * ((pw[node] / pw[i]) / g[node].size()) * b[i];  
        b[node] %= MOD;
    }
 
    w[node] = pw[node] - b[node];
    if (w[node] < 0) w[node] += MOD;
}
 
int count_ways(int L, int R) 
{
    L++; R++;
    for (int i = L ; i <= R ; ++i)
    {
        std::swap(b[i], w[i]);
    }
 
    dfs(1);
    return b[1];
}

• Subtask 1: 2 / 2
• Subtask 2: 0 / 7
• Subtask 3: 0 / 9
• Subtask 4: 0 / 4
• Subtask 5: 0 / 12
• Subtask 6: 0 / 27
• Subtask 7: 0 / 28
• Subtask 8: 0 / 11