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Submission #143473

# Submission time Handle Problem Language Result Execution time Memory
143473 2019-08-14T08:25:25 Z dolphingarlic Data Transfer (IOI19_transfer) C++14
100 / 100
 138 ms 2664 KB 
#include "transfer.h"

std::vector<int> get_attachment(std::vector<int> source) {
    std::vector<int> v;
    int x = 0;
    for (int i = 0; i < source.size(); i++)
        if (source[i]) x ^= (i + 1);

    int last = 0;
    if (source.size() < 64) {
        for (int i = 0; i < 6; i++) {
            v.push_back(x & 1);
            if (x & 1) last = 1 - last;
            x >>= 1;
        }
    } else {
        for (int i = 0; i < 8; i++) {
            v.push_back(x & 1);
            if (x & 1) last = 1 - last;
            x >>= 1;
        }
    }
    v.push_back(last);
    return v;
}

std::vector<int> retrieve(std::vector<int> data) {
    int last = data.back();
    data.pop_back();
    int actual_last = 0, x = 0;
    if (data.size() < 71) {
        for (int i = 0; i < 6; i++) {
            x <<= 1;
            x += data.back();
            if (data.back()) actual_last = 1 - actual_last;
            data.pop_back();
        }
    } else {
        for (int i = 0; i < 8; i++) {
            x <<= 1;
            x += data.back();
            if (data.back()) actual_last = 1 - actual_last;
            data.pop_back();
        }
    }

    if (actual_last != last) return std::vector<int>(data.begin(), data.end());

    int actual_x = 0;
    for (int i = 0; i < data.size(); i++) {
        if (data[i]) actual_x ^= (i + 1);
    }

    int error = actual_x ^ x;
    if (error == 0) return data;

    data[error - 1] = 1 - data[error - 1];
    return data;
}

Compilation message

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:6:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < source.size(); i++)
                     ~~^~~~~~~~~~~~~~~
transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < data.size(); i++) {
                     ~~^~~~~~~~~~~~~

Subtask #1
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1016 KB Output is correct
2 Correct 6 ms 968 KB Output is correct
3 Correct 6 ms 1016 KB Output is correct
4 Correct 6 ms 1016 KB Output is correct
5 Correct 7 ms 1016 KB Output is correct
6 Correct 6 ms 1024 KB Output is correct
7 Correct 6 ms 1024 KB Output is correct
8 Correct 6 ms 1100 KB Output is correct
9 Correct 6 ms 1016 KB Output is correct
10 Correct 6 ms 1108 KB Output is correct
11 Correct 6 ms 896 KB Output is correct
12 Correct 6 ms 896 KB Output is correct
13 Correct 6 ms 1024 KB Output is correct
14 Correct 6 ms 1024 KB Output is correct
15 Correct 6 ms 896 KB Output is correct
16 Correct 6 ms 1016 KB Output is correct
17 Correct 6 ms 972 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 2656 KB Output is correct
2 Correct 61 ms 2604 KB Output is correct
3 Correct 61 ms 2612 KB Output is correct
4 Correct 68 ms 2472 KB Output is correct
5 Correct 69 ms 2476 KB Output is correct
6 Correct 70 ms 2652 KB Output is correct
7 Correct 68 ms 2476 KB Output is correct
8 Correct 61 ms 2636 KB Output is correct
9 Correct 55 ms 2604 KB Output is correct
10 Correct 55 ms 2612 KB Output is correct
11 Correct 54 ms 2612 KB Output is correct
12 Correct 61 ms 2664 KB Output is correct
13 Correct 67 ms 2628 KB Output is correct
14 Correct 60 ms 2612 KB Output is correct
15 Correct 63 ms 2612 KB Output is correct
16 Correct 138 ms 2612 KB Output is correct
17 Correct 64 ms 2612 KB Output is correct
18 Correct 62 ms 2608 KB Output is correct
19 Correct 58 ms 2620 KB Output is correct