Submission #1222808

#	Time	Username	Problem	Language	Result	Execution time	Memory
1222808		cpdreamer	Digital Circuit (IOI22_circuit)	C++20	18 / 100	3043 ms	6380 KiB

circuit

#include "circuit.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
const long long INF = 1e17;
typedef long long ll;
const ll MOD = 1000002022;
#define S second
#define F first
#define pb push_back
#define V vector
#define all(v) v.begin(), v.end()
V<int>adj[(int)1e5+1];
ll dp[(int)2e5+1][2];
int a[(int)2e5+1];
ll add(ll a,ll b) {
    return ((a%MOD)+(b%MOD))%MOD;
}
ll mul(ll a,ll b) {
    return ((a%MOD*(b%MOD)))%MOD;
}
void init(int N, int M, std::vector<int> P, std::vector<int> A) {
    for (int i =1;i<N+M;i++) {
        adj[i].pb(P[i]);
        adj[P[i]].pb(i);
    }
    for (int i=0;i<M;i++) {
        a[i+N]=A[i];
    }
}
void dfs(int n,int p) {
    for (auto u:adj[n]) {
        if (u==p)continue;
        dfs(u,n);
    }
    ll ch=(ll)adj[n].size()-1+(n==0);
    if (ch==0) {
        dp[n][0]=(a[n]==0);
        dp[n][1]=(a[n]==1);
        return;
    }
    ll x[ch][2];
    int c=0;
    for (auto u:adj[n]) {
        if (u==p)continue;
        x[c][0]=dp[u][0];
        x[c][1]=dp[u][1];
        c++;
    }
    V<ll>d(ch+1,0LL);
    d[0]=x[0][0];
    d[1]=x[0][1];
    for (ll i=1;i<ch;i++) {
        for (ll j=ch;j>=0;j--) {
            ll y=0LL;
            y=add(y,mul(d[j],x[i][0]));
            if (j>=1) {
                y=add(y,mul(d[j-1],x[i][1]));
            }
            d[j]=y;
        }
    }
    ll ans0=0,ans1=0;
    for (ll i=0;i<ch;i++) {
        ans0=add(ans0,mul(ch-i,d[i]));
    }
    for (ll i=ch;i>=1;i--) {
        ans1=add(ans1,mul(i,d[i]));
    }
    dp[n][0]=ans0%MOD;
    dp[n][1]=ans1%MOD;
}
int count_ways(int L, int R) {
    for (int i=L;i<=R;i++) {
        a[i]^=1;
    }
    dfs(0,-1);
    return (int)dp[0][1];
}

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