Submission #258879

#	Time	Username	Problem	Language	Result	Execution time	Memory
258879		mjkocijan	Data Transfer (IOI19_transfer)	C++14	100 / 100	447 ms	2680 KiB

transfer

#include "transfer.h"
#define pb push_back
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> ii;
#define X first
#define Y second

vector<int> v;
int k;

std::vector<int> get_attachment(std::vector<int> source) {
	if (source.size() == 63) {
		k = 7;
	}
	else {
		k = 9;
	}
	v = vector<int>(k);
	for (int i = 0; i < source.size(); i++) {
		if (source[i]) {
			for (int j = 0; j < v.size(); j++) {
				if ((i + 1) & (1 << j)) {
					v[j] ^= 1;
				}
			}
			v[k - 1] ^= 1;
		}
	}
	return v;
}

vector<int> ret;

std::vector<int> retrieve(std::vector<int> data) {
	int n;
	if (data.size() == 70) {
		n = 63;
		k = 7;
		v = vector<int>(7);
	} else {
		n = 255;
		k = 9;
		v = vector<int>(9);
	}
	for (int i = 0; i < n; i++) {
		if (data[i]) {
			for (int j = 0; j < k; j++) {
				if ((i + 1) & (1 << j)) {
					v[j] ^= 1;
				}
			}
			v[k - 1] ^= 1;
		}
	}
	int r = 0;
	for (int i = 0; i < k - 1; i++) {
		if (data[n + i] != v[i]) {
			r |= (1 << i);
		}
	}
	if (r && v[k - 1] != data[n + k - 1]) data[r - 1] ^= 1;
	//ret = std::vector<int>(data.begin(), data.end()-k);
	//for (int i: ret) cout << i;cout<<endl;
	//return ret;
	return vector<int>(data.begin(), data.end()-k);
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < source.size(); i++) {
                  ~~^~~~~~~~~~~~~~~
transfer.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 0; j < v.size(); j++) {
                    ~~^~~~~~~~~~

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