Submission #679331

#	Time	Username	Problem	Language	Result	Execution time	Memory
679331		Magikarp4000	Data Transfer (IOI19_transfer)	C++17	40 / 100	63 ms	2528 KiB

transfer

#include "transfer.h"
#include <bits/stdc++.h>
using namespace std;
#define OPTM ios_base::sync_with_stdio(0); cin.tie(0);
#define INF int(1e9+7)
#define ln '\n'
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define us unsigned short
#define FOR(i,s,n) for (int i = s; i < n; i++)
#define FORR(i,n,s) for (int i = n; i > s; i--)
#define FORX(u, arr) for (auto u : arr)
#define PB push_back
#define in(v,x) (v.find(x) != v.end())
#define F first
#define S second
#define PII pair<int, int>
#define PLL pair<ll, ll>
#define UM unordered_map
#define US unordered_set
#define PQ priority_queue
#define ALL(v) v.begin(), v.end()
const ll LLINF = 1e18+1;

std::vector<int> get_attachment(std::vector<int> s) {
    int n = s.size();
    int k = 0, p = 0;
    FOR(i,0,n) {
        if (s[i] == 1) k ^= (i+1);
    }
    vector<int> res;
    int i = 0;
    while ((1<<i) <= k) {
        if (k&(1<<i)) res.PB(1);
        else res.PB(0);
        i++;
    }
	FOR(j,0,6-i) res.PB(0);
	int cnt = 0;
	FORX(u,res) cnt += u;
    res.PB(cnt%2);
    return res;
}

std::vector<int> retrieve(std::vector<int> d) {
    int n = 0, dn = d.size();
    int x = 0, y = 0;
    if (dn < 255) n = 5;
    else n = 255;
	int cnt = 0;
    FOR(i,n,dn-1) {
        x += d[i]*(1<<(i-n));
		cnt += d[i];
    }
    if (cnt%2 == d[dn-1]) {
        FOR(i,0,n) {
			if (d[i] == 1) y ^= i+1;
		}
        x ^= y;
        if (x-1 >= 0) d[x-1] ^= 1;
    }
    return std::vector<int>(d.begin(),d.begin()+n);
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:28:16: warning: unused variable 'p' [-Wunused-variable]
   28 |     int k = 0, p = 0;
      |                ^

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