Submission #864602

#	Time	Username	Problem	Language	Result	Execution time	Memory
864602		ThylOne	Data Transfer (IOI19_transfer)	C++14	60 / 100	4 ms	2508 KiB

transfer

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

using namespace std;


std::vector<int> get_attachment(std::vector<int> source) {
	int xorIndex=0;
	int xor0;
	for(int i=1;i<=source.size();i++){
		if(source[i-1]){
			xorIndex^=i;
		}
		
	}
	
	vector<int> bits(7);
	int sum=0;
	for(int i=0;i<6;i++){
		bits[i]=(xorIndex>>i)&1;
		sum+=bits[i];
	}
	bits[6]=sum&1;
	return bits;
}

std::vector<int> retrieve(std::vector<int> data) {
	int len = data.size()-7;
	int xorIndex=0;
	
	for(int i=1;i<=len;i++){
		
		if(data[i-1]){
			xorIndex^=i;
		}
	}
	int restitution=0;
	int sum=0;
	for(int i=0;i<6;i++){
		if(data[i+len]){
			restitution+=(1<<i);
		}
		sum+=data[i+len];
	}
	
	int fake = xorIndex^restitution;

	vector<int> real=data;
	for(int i=0;i<7;i++)real.pop_back();
	if(fake>0 && !((sum&1)!=data[data.size()-1]))
		real[fake-1] = !real[fake-1];
	
	
	return real;
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:10:15: 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=1;i<=source.size();i++){
      |              ~^~~~~~~~~~~~~~~
transfer.cpp:9:6: warning: unused variable 'xor0' [-Wunused-variable]
    9 |  int xor0;
      |      ^~~~

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