Submission #703946

#	Time	Username	Problem	Language	Result	Execution time	Memory
703946		boyliguanhan	Data Transfer (IOI19_transfer)	C++17	100 / 100	128 ms	2500 KiB

transfer

#include "transfer.h"
#include <bits/stdc++.h>
#define bit(v) ( v.size() < 99 ? 6 : 8)
using namespace std;
vector<int> convert(int org, int bits) {
	vector<int> res(bits);
	for (int i = 0; i < bits; i++)
		res[i] = (bool)(org & 1 << i);
	return res;
}
int change(vector<int> v) {
	int xored = 0;
	for (int i = 0; i < v.size(); i++)
		if (v[i])
			xored ^= i + 1;
	return xored;
}
int rev(vector<int> v) {
	int n = 0;
	for (int i = 0; i < v.size(); i++)
		n += v[i] << i;
	return n;
}
std::vector<int> get_attachment(std::vector<int> source) {
	vector<int> res = convert(change(source), bit(source));
	res.push_back(count(source.begin(), source.end(), 1) % 2);
	return res;
}
bool corrupt(vector<int> v) {
	return vector<int>(v.end() - bit(v), v.end()) != convert(change(vector<int>(v.begin(), v.end() - bit(v))), bit(v));
}
std::vector<int> retrieve(std::vector<int> data) {
	vector<int> res = std::vector<int>(data.begin(), data.end() - bit(data) - 1);
	int x = count(res.begin(), res.end(), 1);
	if (corrupt(std::vector<int>(data.begin(), data.end() - 1))) {
		if (x % 2 != data[data.size() - 1]) {
			int cb = rev(vector<int>(data.end() - bit(data) - 1, data.end() - 1)) ^ change(vector<int>(data.begin(), data.end() - bit(data) - 1));
			res[cb - 1] = !res[cb - 1];
		}
	}
	return res;
}

Compilation message (stderr)

transfer.cpp: In function 'int change(std::vector<int>)':
transfer.cpp:13:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |  for (int i = 0; i < v.size(); i++)
      |                  ~~^~~~~~~~~~
transfer.cpp: In function 'int rev(std::vector<int>)':
transfer.cpp:20:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |  for (int i = 0; i < v.size(); i++)
      |                  ~~^~~~~~~~~~

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