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Submission #668696

# Submission time Handle Problem Language Result Execution time Memory
668696 2022-12-04T14:16:45 Z finn__ Data Transfer (IOI19_transfer) C++17
100 / 100
 52 ms 2504 KB 
#include "transfer.h"

std::vector<int> get_attachment(std::vector<int> source)
{
    unsigned const lgn = 32 - __builtin_clz(source.size());
    std::vector<int> y(lgn + 1, 0);

    int x = 0;

    for (unsigned i = 1; i <= source.size(); i++)
    {
        y[0] ^= source[i - 1];
        x ^= source[i - 1] * i;
    }
    for (unsigned i = 1; i <= lgn; i++)
        y[i] = (x >> (lgn - i)) & 1;

    return y;
}

std::vector<int> retrieve(std::vector<int> data)
{
    unsigned const lgn = 31 - __builtin_clz(data.size());
    unsigned const n = 1 << lgn;
    int p = 0, x = 0;

    for (unsigned i = 1; i <= n - 1; i++)
    {
        p ^= data[i - 1];
        x ^= data[i - 1] * i;
    }

    if (p == data[n - 1])
        return std::vector<int>(data.begin(), data.begin() + n - 1);

    int y = 0;
    for (unsigned i = 0; i < lgn; i++)
        y = (y << 1) | data[n + i];

    if (y != x)
        data[(y ^ x) - 1] ^= 1;
    return std::vector<int>(data.begin(), data.begin() + n - 1);
}

Subtask #1
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 636 KB Output is correct
2 Correct 3 ms 652 KB Output is correct
3 Correct 2 ms 652 KB Output is correct
4 Correct 2 ms 644 KB Output is correct
5 Correct 2 ms 644 KB Output is correct
6 Correct 3 ms 648 KB Output is correct
7 Correct 2 ms 644 KB Output is correct
8 Correct 1 ms 644 KB Output is correct
9 Correct 2 ms 736 KB Output is correct
10 Correct 2 ms 644 KB Output is correct
11 Correct 2 ms 732 KB Output is correct
12 Correct 2 ms 644 KB Output is correct
13 Correct 2 ms 644 KB Output is correct
14 Correct 3 ms 732 KB Output is correct
15 Correct 2 ms 640 KB Output is correct
16 Correct 2 ms 644 KB Output is correct
17 Correct 2 ms 744 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 2496 KB Output is correct
2 Correct 40 ms 2496 KB Output is correct
3 Correct 39 ms 2424 KB Output is correct
4 Correct 39 ms 2488 KB Output is correct
5 Correct 40 ms 2484 KB Output is correct
6 Correct 41 ms 2504 KB Output is correct
7 Correct 40 ms 2488 KB Output is correct
8 Correct 47 ms 2492 KB Output is correct
9 Correct 43 ms 2488 KB Output is correct
10 Correct 40 ms 2496 KB Output is correct
11 Correct 52 ms 2488 KB Output is correct
12 Correct 43 ms 2488 KB Output is correct
13 Correct 41 ms 2428 KB Output is correct
14 Correct 41 ms 2488 KB Output is correct
15 Correct 41 ms 2488 KB Output is correct
16 Correct 42 ms 2472 KB Output is correct
17 Correct 45 ms 2492 KB Output is correct
18 Correct 42 ms 2488 KB Output is correct
19 Correct 44 ms 2488 KB Output is correct