Submission #1028321

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028321		42kangaroo	Digital Circuit (IOI22_circuit)	C++17	18 / 100	3048 ms	3344 KiB

circuit

#include "circuit.h"

#include <vector>

using namespace std;

vector<int> a;
using g_t = vector<vector<int>>;
g_t g;

using ll = long long;

constexpr ll mod = 1000002022;

void init(int N, int M, std::vector<int> P, std::vector<int> A) {
	g = g_t(N);
	for (int i = 1; i < N + M; ++i) {
		g[P[i]].push_back(i);
	}
	a = A;
}

int count_ways(int L, int R) {
	L -= g.size();
	R -= g.size();
	for (int i = L; i <= R; ++i) {
		a[i] = 1 - a[i];
	}
	vector<ll> nuP(g.size()), nuT(g.size());
	for (int i = g.size() - 1; i >= 0; --i) {
		ll su = 1;
		ll suMult = 0;
		nuT[i] = g[i].size();
		for (auto e: g[i]) {
			if (e >= g.size()) {
				if (a[e - g.size()] == 1) {
					suMult = suMult + su;
					suMult %= mod;
				}
			} else {
				nuT[i] = (nuT[i] * nuT[e]) % mod;
				suMult = ((suMult * nuT[e]) % mod + (su * nuP[e]) % mod + mod) % mod;
				su = (nuT[e] * su) % mod;
			}
		}
		nuP[i] = suMult;
	}
	return nuP.front();
}

Compilation message (stderr)

circuit.cpp: In function 'int count_ways(int, int)':
circuit.cpp:35:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |    if (e >= g.size()) {
      |        ~~^~~~~~~~~~~

• 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