Submission #1191853

#	Time	Username	Problem	Language	Result	Execution time	Memory
1191853		ortsac	Data Transfer (IOI19_transfer)	C++20	100 / 100	111 ms	1728 KiB

transfer

#include <bits/stdc++.h>
#include "transfer.h"

using namespace std;

vector<int> get_attachment(vector<int> source) {
	int n = source.size();
	int B = 8;
	if (n == 63) B = 6;
	vector<int> ans(B);
	int sum = 0;
	for (int i = 0; i < B; i++) {
		for (int j = 1; j <= n; j++) {
			if ((j & (1 << i)) && source[j - 1]) ans[i]++; 
		}
		ans[i] %= 2;
		sum += ans[i];
	}
	sum %= 2;
	ans.push_back(sum);
	return ans;
}

vector<int> retrieve(vector<int> data) {
	int B = 8;
	if (((int) data.size()) == 70) B = 6;
	vector<int> ot;
	for (int i = 0; i <= B; i++) {
		ot.push_back(data.back());
		data.pop_back();
	}
	reverse(ot.begin(), ot.end());
	int sum = 0;
	for (int i = 0; i < B; i++) sum = ((sum + ot[i])%2);
	if (sum != ot[B]) return data;
	int n = data.size();
	int ans = 0;
	for (int i = 0; i < B; i++) {
		int curr = 0;
		for (int j = 1; j <= n; j++) {
			if ((j & (1 << i)) && data[j - 1]) curr++; 
		}
		curr %= 2;
		if (curr != ot[i]) ans += (1 << i);
	}
	if (ans == 0) return data;
	data[ans - 1] = (1 - data[ans - 1]);
	return data;
}

• Subtask 1: 60 / 60
• Subtask 2: 40 / 40