Submission #750843

#	Time	Username	Problem	Language	Result	Execution time	Memory
750843		inventiontime	Digital Circuit (IOI22_circuit)	C++17	18 / 100	15 ms	2880 KiB

circuit

#include "circuit.h"

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define re resize
#define ff first
#define ss second

#define all(x) (x).begin(), (x).end()
#define all1(x) (x).begin()+1, (x).end()
#define loop(i, n) for(int i = 0; i < n; i++)
#define loop1(i, n) for(int i = 1; i <= n; i++)

#define print(x) cout << #x << ": " << x << endl << flush

template<class T> bool ckmin(T&a, T b) { bool B = a > b; a = min(a, b); return B; }
template<class T> bool ckmax(T&a, T b) { bool B = a < b; a = max(a, b); return B; }

typedef long long ll;
typedef vector<ll> vl;
typedef vector<int> vi;

const int mod = 1e9+2022;
const int maxn = 1e3+5;

int n, m;
vi p, a;
vi adj[maxn];

void init(int N, int M, vi P, vi A) {
    n = N; m = M; p = P; a = A;
    loop(i, n+m) if(i)
        adj[p[i]].pb(i);
}

int count_ways(int l, int r) {

    for(int i = l-n; i <= r-n; i++) a[i] = !a[i];

    ll res = 0;

    vl ways1(n+m);
    vl ways0(n+m);

    auto dfs = [&] (int u, auto dfs) -> void {
        if(n-1 < u) {
            ways0[u] = !a[u-n];
            ways1[u] = a[u-n];
            return;
        }

        ll c = adj[u].size();
        vl dp(c+1);
        ll cnt = 0;
        dp[0] = 1;
        for(auto v : adj[u]) {
            dfs(v, dfs);
            cnt++;
            for(int i = cnt; i > 0; i--) 
                dp[i] = (ways0[v] * dp[i]
                      + ways1[v] * dp[i-1]) % mod;
            dp[0] = (ways0[v] * dp[0]) % mod;
        }
        loop(i, c+1) {
            ways1[u] += dp[i] * i;
            ways1[u] %= mod;
            ways0[u] += dp[i] * (c-i);
            ways0[u] %= mod;
        }
    };
    dfs(0, dfs);

    res = ways1[0];
    return res;

}

• 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