Submission #438113

#	Time	Username	Problem	Language	Result	Execution time	Memory
438113		CyanForces	Bit Shift Registers (IOI21_registers)	C++17	22 / 100	1 ms	332 KiB

registers

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

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define trav(a, x) for(auto& a : x)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

#include "registers.h"

int s, n, k, q;
int ops = 0;
vector<bool> negOne(2000);
vector<bool> signBit(2000);
vector<bool> oneNum(2000);

const int negOneIndex = 99;
const int signBitIndex = 98;
const int oneNumIndex = 97;
const int workRegister = 96;

void spread() {
	for(int i = 0; i < n; i++) {
		append_and(workRegister, 0, oneNumIndex);
		if (i != n-1) {
			append_left(oneNumIndex, oneNumIndex, k+2);
			append_left(0, 0, 2);
		}
		append_or(1, 1, workRegister);
	}
}

void divide() {
	int leftNumbers = (n+1) / 2;
	append_move(2, 1);
	append_right(2, 2, leftNumbers * (k+2));
	if (n % 2 != 0) {
		vector<bool> tempExtra(2000);
		rep(i,0,2000) {
			tempExtra[i] = (n-leftNumbers)*(k+2) <= i && i < (n-leftNumbers+1)*(k+2)-1;
		}
		append_store(3, tempExtra);
		append_or(2, 2, 3);
	}
}

void spreadSigns(int d) {
	append_right(workRegister, 0, d);
	append_or(0, 0, workRegister);
}
//(a & (a>=b))  ^ (b & (a<b))
void combine() {
	append_add(0, negOneIndex, 2); // b-1
	append_not(0, 0); // !(b-1)
	append_add(0, 0, 1); // a-b

	append_and(0, 0, signBitIndex);
	//rep(_,0,k+1) spreadSigns(1);
	int curr = 1;
	while(curr*2 < k+2) {
		spreadSigns(curr);
		curr *= 2;
	}
	if (k+2 != curr)
		spreadSigns(k+2 - curr);

	append_not(workRegister, 0);
	// registry 0 contains zeros if a >= b, else 1
	// => registry 0 contains a >= b
	// => workRegister contains a < b
	append_and(0, 0, 2);
	append_and(workRegister, workRegister, 1);

	//append_xor(1, 1, 2);
	append_xor(1, 0, workRegister);
	//append_xor(1, 1, 2);
}

void print() {
	rep(i,0,3) append_print(i);
}

void findMin() {
	spread();
	while(n > 1) {
		print();
		divide();
		print();
		combine();
		print();
		n = (n+1) / 2;
	}
	print();
	append_move(0, 1);
}

void construct_instructions(int _s, int _n, int _k, int _q) {
	s = _s;
	n = _n;
	k = _k;
	q = _q;
	int a = 0;
	int b = k+2;
	while(b < 2000) {
		for(int j = a; j < b; j++) negOne[j] = j != b-1;
		a = b;
		b += k+2;
	}
	for(int i = 0; i < 2000; i++) {
		signBit[i] = i % (k+2) == k+1;
		oneNum[i] = i < k;
	}
	append_store(negOneIndex, negOne);
	append_store(signBitIndex, signBit);
	append_store(oneNumIndex, oneNum);

	if (s == 0) {
		findMin();
	}
	else {
		assert(false);
	}
	assert(ops <= q);
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 11
• Subtask 3: 12 / 12
• Subtask 4: 0 / 25
• Subtask 5: 0 / 13
• Subtask 6: 0 / 29