| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 829804 | 2023-08-18T15:08:42 Z | vqpahmad | Data Transfer (IOI19_transfer) | C++14 | 0 ms | 0 KB |
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ll long long
#define pii pair<int,int>
#define F first
#define S second
#define endl '\n'
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
const int mod = 1e9 + 7;
const int N = 1e6 + 15;
const ll inf = 1e18;
#include "transfer.h"
vector<int> get_attachment(vector<int> source) {
int n = sz(source);
vector<int> a(9);
for (int i=1;i<=n;i++){
for (int b=0;b<8;b++){
if ((i>>b)&1) a[b] ^= source[i-1];
}
}
for (int i=0;i<8;i++){
a[8] ^= a[i];
}
return a;
}
vector<int> retrieve(vector<int> data) {
int n = sz(data)-9;
int ans = 0;
bool ok = 1;
int cur = 0;
for (int i=n;i<n+8;i++){
cur ^= data[i];
}
ok &= data.back()==cur;
vector<int> c(8);
for (int i=1;i<=n;i++){
for (int b=0;b<8;b++){
if ((i>>b)&1) c[b] ^= data[i-1];
}
}
for (int i=n;i<n+8;i++){
if (data[i] != c[i-n]) ans |= (1<<(i-n));
}
vector<int> fin_ans(n);
if (ans==0 or !ok){
for (int i=0;i<n;i++){
fin_ans[i] = data[i];
}
}
else {
for (int i=0;i<n;i++){
if (ans!=i-1) fin_ans[i] = data[i];
else fin_ans[i] = data[i]^1;
}
}
return fin_ans;
// if ans==0 or !ok print the orginal else orginal^ans
}