Submission #829604

#	Time	Username	Problem	Language	Result	Execution time	Memory
829604		birthdaycake	Data Transfer (IOI19_transfer)	C++17	0 / 100	6 ms	4476 KiB

transfer

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



vector<int> get_attachment(vector<int> source) {
	vector<int>d; 
	int x1 = 0, x2 = 0; 
	for(int i = 0; i < source.size(); i++){
		x1 ^= source[i]; 
		if(source[i] == 1) x2 ^= i;
		d.push_back(source[i]);
	}
	d.push_back(x1);
	for(int i = 0; i < 8; i++){
		if(x2 & (1 << i)) d.push_back(1);
		else d.push_back(0);
	}
	return d; 
}

vector<int> retrieve(vector<int> data) {
	int x1 = 0, x2 = 0;
	if(data.size() == 72){
		for(int i = 0; i < 63; i++){
			x1 ^= data[i]; 
			if(data[i] == 1) x2 ^= i; 
		}
		vector<int>ans; 
		if(x1 == data[63]){
			for(int i = 0; i < 63; i++){
				ans.push_back(data[i]);
			}
			return ans;
		}else{
			int num = 0;
			for(int i = 64; i < 72; i++){
				if(data[i] == 1){
					num += (1 << (i - 64));
				}
			}
			if(num == x2){
				for(int i = 0; i < 63; i++) ans.push_back(data[i]);
				return ans;
			}else{
				data[x2 ^ num] = !data[x2 ^ num]; 
				for(int i = 0; i < 63; i++) ans.push_back(data[i]);
				return ans;
			}
		}
	}
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:10:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for(int i = 0; i < source.size(); i++){
      |                 ~~^~~~~~~~~~~~~~~
transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:53:1: warning: control reaches end of non-void function [-Wreturn-type]
   53 | }
      | ^

• Subtask 1: 0 / 60
• Subtask 2: 0 / 40