Submission #1063297

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063297		jer033	Digital Circuit (IOI22_circuit)	C++17	0 / 100	1 ms	344 KiB

circuit

#include "circuit.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll MOD =  1'000'002'022;

int n, m;
vector<ll> storage;//When you call the constructor, make sure that everything is reduced modulo MOD
vector<int> a;

class Lazy{
public:
    int L, R;
    ll total_sum;
    ll active;//MAKE SURE THAT THIS IS ALWAYS ACCURATE
    bool flip;//When I need to flip, I don't need to flip myself, I need to flip my children only
    Lazy* left;
    Lazy* right;

    Lazy(int l, int r)
    {
        L = l; R = r;
        flip = 0;
        if (L==R)
        {
            left = nullptr;
            right = nullptr;
            total_sum = storage[L];
            if (a[L] == 1)
                active = total_sum;
            else
                active = 0;
        }
        else
        {
            int mid = (l+r)/2;
            left = new Lazy(l, mid);
            right = new Lazy(mid+1, r);
            total_sum = left->total_sum + right->total_sum;
            active = left->active + right->active;
        }
    }

    void update()
    {
        //assumption: My children could have just updated themselves, and so should I
        if (left!=nullptr)
            active = left->active + right->active;
    }

    void pancake_flip()
    {
        //assumption: this is updated, and I want to update myself
        active = total_sum - active;
        if (flip == 0)
            flip = 1;
        else
            flip = 0;
    }

    void push_down()
    {
        //assumption: this is updated, and I want to update my children
        if (flip == 1)
        {
            flip = 0;
            if (left != nullptr)
            {
                left->pancake_flip();
                right->pancake_flip();
            }
        }
    }

    void range_flip(int range_l, int range_r)
    {
        int intersect_l = max(range_l, L);
        int intersect_r = min(range_r, R);
        if ((intersect_l == L) and (intersect_r==R))
        {
            pancake_flip();
            push_down();
        }
        else if (intersect_l <= intersect_r)
        {
            push_down();
            left->range_flip(range_l, range_r);
            right->range_flip(range_l, range_r);
            update();
        }
    }
};

Lazy circ = Lazy(0, 0);

void init(int N, int M, std::vector<int> P, std::vector<int> A) {
    n = N;
    m = M;
    vector<ll> degrees(N, 0);
    for (int i=1; i<(N+M); i++)
        degrees[P[i]]++;
    vector<vector<bool>> ancestor(N+M, vector<bool> (N, 0));
    for (int i=1; i<(N+M); i++)
    {
        int par = P[i];
        for (int j=0; j<N; j++)
            ancestor[i][j] = ancestor[par][j];
        ancestor[i][par] = 1;
    }
    a = A;
    for (int i=N; i<(N+M); i++)
    {
        ll ans = 1;
        for (int j = 0; j<N; j++)
            if (ancestor[i][j] == 0)
                ans = (ans*degrees[j])%MOD;
        storage.push_back(ans);
    }
    circ = Lazy(0, M-1);
}

int count_ways(int L, int R) {
    L -= n;
    R -= n;
    circ.range_flip(L, R);
    /*for (int i=L; i<=R; i++)
        a[i] = 1-a[i];
    ll total = 0;
    for (int i=0; i<m; i++)
    {
        if (a[i]==1)
            total = total+storage[i];
    }*/
    ll fa = circ.active%MOD;
    int ffa = fa;
    return ffa;
}

• Subtask 1: 0 / 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