Submission #1030787

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030787		coolboy19521	Data Transfer (IOI19_transfer)	C++17	100 / 100	34 ms	2520 KiB

transfer

#include "transfer.h"
#include "iostream"

using namespace std;

vector<int> solve63(vector<int>& data) {
    int xsl = 0;
    int xsr = 0;
    for (int i = 63; i < 69; i ++)
        xsr |= data[i] * (1 << (i - 63));
    for (int i = 1; i <= 63; i ++)
        xsl ^= data[i - 1] * i;
    int ev = data[69];
    vector<int> v(data.begin(), data.begin() + 63);
    if (ev != (__builtin_popcount(xsr) & 1))
        return v;
    if (xsl == xsr) return v;
    int vl = (xsl ^ xsr) - 1;
    v[vl] = 1 - v[vl];
    return v;
}

vector<int> solve255(vector<int>& data) {
    int xsl = 0;
    int xsr = 0;
    for (int i = 255; i < 263; i ++)
        xsr |= data[i] * (1 << (i - 255));
    for (int i = 1; i <= 255; i ++)
        xsl ^= data[i - 1] * i;
    int ev = data[263];
    vector<int> v(data.begin(), data.begin() + 255);
    if (ev != (__builtin_popcount(xsr) & 1))
        return v;
    if (xsl == xsr) return v;
    int vl = (xsl ^ xsr) - 1;
    v[vl] = 1 - v[vl];
    return v;
}

vector<int> get_attachment(vector<int> source) {
    int n = source.size();
    int xs = 0;

    for (int i = 1; i <= n; i ++)
        xs ^= source[i - 1] * i;

    //cout << xs << '\n';

    vector<int> v;
    if (63 == n)
        for (int i = 0; i < 6; i ++) {
            int b = 0 < (xs & (1 << i));
            v.push_back(b);
        }
    else
        for (int i = 0; i < 8; i ++) {
            int b = 0 < (xs & (1 << i));
            v.push_back(b);
        }
    v.push_back(__builtin_popcount(xs) & 1);
    return v;
}

vector<int> retrieve(vector<int> data) {
    int m = data.size();
    if (70 == m)
        return solve63(data);
    return solve255(data);
}

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