Submission #938986

#	Time	Username	Problem	Language	Result	Execution time	Memory
938986		irmuun	Digital Circuit (IOI22_circuit)	C++17	2 / 100	3022 ms	7060 KiB

circuit

#include<bits/stdc++.h>
#include "circuit.h"

using namespace std;

#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

const int mod=1000002022;

const int maxn=2e5;
vector<int>adj[maxn];
vector<int>a;
int n,m;

void init(int N,int M,vector<int>p,vector<int>A){
    n=N;
    m=M;
    a=A;
    for(int i=1;i<n+m;i++){
        adj[p[i]].pb(i);
    }
}

int count_ways(int l,int r){
    if(n==1){
        l-=n;
        r-=n;
        int cnt=0;
        for(int i=0;i<m;i++){
            if(l<=i&&i<=r){
                a[i]=1-a[i];
            }
            cnt+=a[i];
        }
        return cnt;
    }
    l-=n;
    r-=n;
    for(int i=l;i<=r;i++){
        a[i]=1-a[i];
    }
    int ans=0;
    int cnt[n+m+5][2];//number of ways end with 0/1
    for(int j=n;j<n+m;j++){
        cnt[j][a[j-n]]=1;
        cnt[j][1-a[j-n]]=0;
    }
    for(int i=n-1;i>=0;i--){
        int sz=adj[i].size();
        int dp[sz+1];
        fill(dp,dp+sz+1,0);
        dp[0]=1;
        int cur=0;
        for(int x:adj[i]){
            cur++;
            for(int j=cur-1;j>=0;j--){
                dp[j+1]+=1ll*dp[j]*cnt[x][1];
                dp[j+1]%=mod;
                dp[j]+=1ll*dp[j]*cnt[x][0];
                dp[j]%=mod;
            }
        }
        int c1=0,c0=0;
        for(int j=0;j<=cur;j++){
            c1+=dp[j];
            c1%=mod;
        }
        for(int j=cur;j>=1;j--){
            cnt[i][1]+=c1;
            cnt[i][1]%=mod;
            cnt[i][0]+=c0;
            cnt[i][0]%=mod;
            c0=(c0+dp[j])%mod;
            c1=(c1-dp[j]+mod)%mod;
        }
    }
    return cnt[0][1];
}

Compilation message (stderr)

circuit.cpp: In function 'int count_ways(int, int)':
circuit.cpp:47:9: warning: unused variable 'ans' [-Wunused-variable]
   47 |     int ans=0;
      |         ^~~

• 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