Submission #681088

#	Time	Username	Problem	Language	Result	Execution time	Memory
681088		AngusWong	Digital Circuit (IOI22_circuit)	C++17	22 / 100	3077 ms	24136 KiB

circuit

#include "circuit.h"
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define f first
#define s second
using namespace std;

const ll mod=1e9+2022;
const ll N=2e5+9;
ll n, m, a[N], pw[N], cnt[N], ans=0;
vector<ll> v[N], pre[N], suf[N];

void dfs(ll x){
    if (x>=n){
        pw[x]=1;
        return;
    }
    pw[x]=v[x].size();
    for (ll i: v[x]){
        dfs(i);
        pw[x]=pw[x]*pw[i]%mod;
    }
}

void dfs2(ll x, ll now=1){
    if (x>=n){
        cnt[x]=now;
        return;
    }
    ll sz=v[x].size();
    pre[x].resize(sz);
    pre[x][0]=pw[v[x][0]];
    for (int i=1; i<sz; i++) pre[x][i]=pre[x][i-1]*pw[v[x][i]]%mod;
    suf[x].resize(sz);
    suf[x][sz-1]=pw[v[x][sz-1]];
    for (int i=sz-2; i>=0; i--) suf[x][i]=suf[x][i+1]*pw[v[x][i]]%mod;
    for (int i=0; i<sz; i++){
        ll tmp=now;
        if (i) tmp=tmp*pre[x][i-1]%mod;
        if (i<sz-1) tmp=tmp*suf[x][i+1]%mod;
        dfs2(v[x][i], tmp);
    }
}

void init(int N, int M, vector<int> P, vector<int> A){
    n=N, m=M;
    for (int i=1; i<n+m; i++) v[P[i]].push_back(i);
    for (int i=0; i<m; i++) a[i+n]=A[i];
    dfs(0);
    dfs2(0);
    for (int i=n; i<n+m; i++){
        if (a[i]) ans=(ans+cnt[i])%mod;
    }
}

int count_ways(int L, int R){
    for (int i=L; i<=R; i++){
        a[i]^=1;
        if (a[i]) ans=(ans+cnt[i])%mod;
        else ans=(ans-cnt[i]+mod)%mod;
    }
    return ans;
}

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