Submission #1028351

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028351		42kangaroo	Digital Circuit (IOI22_circuit)	C++17	0 / 100	468 ms	2648 KiB

circuit

#include "circuit.h"

#include <vector>

using namespace std;

int ma;
using ll = long long;

constexpr ll mod = 1000002022;

struct SVal {
	ll pos, fpos, tPos;
};

SVal comb(SVal l, SVal r) {
	return SVal{((2*l.tPos*r.tPos)%mod - ((l.tPos - l.pos)*(r.tPos - r.pos))%mod + mod + (l.pos*r.pos)%mod)%mod, ((2*l.tPos*r.tPos)%mod - ((l.tPos - l.fpos)*(r.tPos - r.fpos))%mod + mod + (l.fpos*r.fpos)%mod)%mod, (2*l.tPos*r.tPos)%mod};
}

struct SegTe {
	vector<SVal> a;
	vector<bool> lazy;

	void push(int i) {
		if (lazy[i]) {
			swap(a[i].pos, a[i].fpos);
			if (2*i + 2 < a.size()) {
				lazy[2*i + 1] = !lazy[2*i + 1];
				lazy[2*i + 2] = !lazy[2*i + 2];
			}
			lazy[i] = false;
		}
	}

	SVal toggle(int l, int r, int i, int lq, int rq) {
		push(i);
		if (rq <= l || r <= lq) return a[i];
		if (lq <= l && r <= rq) {
			lazy[i] = true;
			push(i);
			return a[i];
		}
		int m = (l + r)/2;
		return a[i] = comb(toggle(l, m, 2*i + 1, lq, rq), toggle(m, r, 2*i + 2, lq, rq));
	}
};

SegTe se;

void init(int N, int M, std::vector<int> P, std::vector<int> A) {
	ma = N;
	se = SegTe{vector<SVal>(2*M, SVal{0, 1, 1}), vector<bool>(2*M, false)};
	for (int i = 0; i < M; ++i) {
		se.toggle(0, M, 0, i, i + 1);
	}
}

int count_ways(int L, int R) {
	L -= ma;
	R -= ma;
	return se.toggle(0, ma + 1, 0, L, R + 1).pos;
}

Compilation message (stderr)

circuit.cpp: In member function 'void SegTe::push(int)':
circuit.cpp:27:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<SVal>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |    if (2*i + 2 < a.size()) {
      |        ~~~~~~~~^~~~~~~~~~

• Subtask 1: 0 / 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