Submission #711216

#	Time	Username	Problem	Language	Result	Execution time	Memory
711216		Darren0724	Data Transfer (IOI19_transfer)	C++17	60 / 100	7 ms	2488 KiB

transfer

#include "transfer.h"
//#include "grader.cpp"
#include <bits/stdc++.h>
using namespace std;
std::vector<int> get_attachment(std::vector<int> source) {
	int n=source.size();
    vector<int> a(7),b(7);
    for(int j=0;j<6;j++){
        for(int i=0;i<n;i++){
            if(i&(1<<j)){
                b[j]^=source[i];
            }
            else{
                a[j]^=source[i];
            }
        }
    }
    for(int i=0;i<n;i++){
        a[6]^=source[i];
    }
    return a;

}

std::vector<int> retrieve(std::vector<int> data) {
    vector<int> v=data;
    int n=v.size();
    vector<int> a(6),b(6);
    for(int i=63;i<69;i++){
        a[i-63]=v[i];
        b[i-63]=v[69]^a[i-63];
    }
    vector<int> a1(6),b1(6);
    for(int j=0;j<6;j++){
        for(int i=0;i<63;i++){
            if(i&(1<<j)){
                b1[j]^=v[i];
            }
            else{
                a1[j]^=v[i];
            }
        }
    }
    int ans=0;
    int cnt=0;
    for(int j=0;j<6;j++){
        if(a[j]!=a1[j]){
            cnt++;
        }
        if(b[j]!=b1[j]){
            cnt++;
            ans^=(1<<j);
        }
    }
    vector<int> ans1(63);
    //cout<<cnt<<' '<<ans<<endl;
    for(int i=0;i<63;i++){
        ans1[i]=v[i];
    }

    if(cnt==6&&ans!=63){
        ans1[ans]^=1;
    }

    return ans1;

}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:27:9: warning: unused variable 'n' [-Wunused-variable]
   27 |     int n=v.size();
      |         ^

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