Submission #1078705

#	Time	Username	Problem	Language	Result	Execution time	Memory
1078705		Gromp15	Digital Circuit (IOI22_circuit)	C++17	18 / 100	3076 ms	3928 KiB

circuit

#include <bits/stdc++.h>
#define ll long long
#define sz(x) (int)x.size()
#define ar array
#include "circuit.h"
using namespace std;

const int mod = int(1e9) + 2022;
void fadd(int &a, int b) {
	a += b;
	if (a >= mod) a -= mod;
}
void fsub(int &a, int b) {
	a -= b;
	if (a < 0) a += mod;
}

vector<int> p, a, sub, sub2;
vector<vector<int>> adj;
int n, m;
void init(int N, int M, std::vector<int> P, std::vector<int> A) {
	n = N, m = M;
	p = P, a = A;
	adj.resize(N), sub.resize(N+M, 1), sub2.resize(N+M, 1);
	for (int i = 1; i < N + M; i++) adj[P[i]].emplace_back(i);
	for (int i = N-1; i >= 0; i--) {
		sub[i] = sz(adj[i]);
		int cur = sz(adj[i]);
		vector<int> pref(cur), suff(cur);
		for (int j = 0; j < cur; j++) {
			pref[j] = suff[j] = sub[adj[i][j]];
		}
		for (int j = 1; j < cur; j++) pref[j] = (ll)pref[j-1] * pref[j] % mod;
		for (int j = cur-2; j >= 0; j--) suff[j] = (ll)suff[j+1] * suff[j] % mod;
		for (int j = 0; j < cur; j++) {
			int u = adj[i][j];
			sub[i] = (ll)sub[i] * sub[u] % mod;
			sub2[u] = (ll)(j ? pref[j-1] : 1) * (j+1 < cur ? suff[j+1] : 1) % mod;
		}
	}
}

int count_ways(int L, int R) {
	for (int i = L; i <= R; i++) a[i - n] ^= 1;
	vector<int> dp(n+m);
	for (int i = n+m-1; i >= 0; i--) {
		if (i >= n) dp[i] = a[i-n];
		else {
			int N = sz(adj[i]);
			for (int u : adj[i]) {
				fadd(dp[i], (ll)dp[u] * sub2[u] % mod);
			}
		}
	}
	return dp[0];
}

Compilation message (stderr)

circuit.cpp: In function 'int count_ways(int, int)':
circuit.cpp:49:8: warning: unused variable 'N' [-Wunused-variable]
   49 |    int N = sz(adj[i]);
      |        ^

• 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