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Submission #920379

# Submission time Handle Problem Language Result Execution time Memory
920379 2024-02-02T13:56:37 Z Pannda Data Transfer (IOI19_transfer) C++17
100 / 100
 30 ms 2704 KB 
#include "transfer.h"

#include <bits/stdc++.h>
using namespace std;

std::vector<int> get_attachment(std::vector<int> source) {
    int n = source.size();
    int xr = 0;
    for (int i = 0; i < n; i++) {
        xr ^= source[i] * (i + 1);
    }
    int k = n == 63 ? 6 : 8;
    vector<int> attachment(k + 1);
    for (int i = 0; i < k; i++) {
        attachment[i] = xr >> i & 1;
    }
    attachment[k] = __builtin_popcount(xr) & 1;
    return attachment;
}

std::vector<int> retrieve(std::vector<int> data) {
	int n = data.size();
	int k = n == 63 + 7 ? 6 : 8;
	n -= k + 1;
	int parity = 0;
	for (int i = n; i < n + k + 1; i++) {
        parity = (parity + data[i]) & 1;
	}
	if (!(parity & 1)) {
        int xr = 0;
        for (int i = n; i < n + k; i++) {
            xr += data[i] << (i - n);
        }
        for (int i = 0; i < n; i++) {
            xr ^= data[i] * (i + 1);
        }
        if (xr > 0) {
            data[xr - 1] ^= 1;
        }
	}
    return vector<int>(data.begin(), data.end() - k - 1);
}

Subtask #1
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 780 KB Output is correct
2 Correct 1 ms 796 KB Output is correct
3 Correct 1 ms 784 KB Output is correct
4 Correct 1 ms 792 KB Output is correct
5 Correct 1 ms 792 KB Output is correct
6 Correct 1 ms 796 KB Output is correct
7 Correct 1 ms 780 KB Output is correct
8 Correct 1 ms 796 KB Output is correct
9 Correct 1 ms 792 KB Output is correct
10 Correct 1 ms 792 KB Output is correct
11 Correct 1 ms 776 KB Output is correct
12 Correct 1 ms 792 KB Output is correct
13 Correct 1 ms 780 KB Output is correct
14 Correct 1 ms 792 KB Output is correct
15 Correct 2 ms 1292 KB Output is correct
16 Correct 1 ms 780 KB Output is correct
17 Correct 1 ms 788 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 2508 KB Output is correct
2 Correct 28 ms 2512 KB Output is correct
3 Correct 29 ms 2500 KB Output is correct
4 Correct 27 ms 2504 KB Output is correct
5 Correct 27 ms 2508 KB Output is correct
6 Correct 28 ms 2704 KB Output is correct
7 Correct 27 ms 2508 KB Output is correct
8 Correct 27 ms 2500 KB Output is correct
9 Correct 28 ms 2504 KB Output is correct
10 Correct 28 ms 2512 KB Output is correct
11 Correct 28 ms 2508 KB Output is correct
12 Correct 28 ms 2508 KB Output is correct
13 Correct 28 ms 2504 KB Output is correct
14 Correct 29 ms 2500 KB Output is correct
15 Correct 27 ms 2508 KB Output is correct
16 Correct 30 ms 2508 KB Output is correct
17 Correct 28 ms 2500 KB Output is correct
18 Correct 27 ms 2512 KB Output is correct
19 Correct 27 ms 2508 KB Output is correct