Submission #572138

#	Time	Username	Problem	Language	Result	Execution time	Memory
572138		RandomLB	Data Transfer (IOI19_transfer)	C++17	100 / 100	102 ms	2500 KiB

transfer

#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
#define siz(x) (int)x.size()
 
vi get_attachment(vi v){
    int xr = 0, on = 0;
    for (int i = 0; i < siz(v); i++) xr ^= (i+1)*v[i];
 	vi res;
    for (int i = 0; i < __lg(siz(v)+1); i++){
        res.push_back(xr&(1<<i)?1:0);
        if (xr&(1<<i)) on ^= 1;
    }
    res.push_back(on);
    return res;
}
 
vi retrieve(vi v){
    int n = (siz(v) < 100? 63 : 255), xr = 0, check = 0;
    vi res;
    for (int i = 0; i < n; i++){
        xr ^= (i+1)*v[i];
        res.push_back(v[i]);
    }
    for (int i = 0; i < __lg(n+1); i++) if (v[n+i]) check ^= (1<<i);
    if (xr != check && __builtin_popcount(check)%2 == v.back()) res[(xr^check)-1] ^= 1;
    return res;
}

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