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Submission #995293

# Submission time Handle Problem Language Result Execution time Memory
995293 2024-06-08T19:18:57 Z biank Data Transfer (IOI19_transfer) C++14
100 / 100
 220 ms 2764 KB 
#include "transfer.h"
 
using namespace std;
 
#define sz(x) int(x.size())
#define all(x) begin(x), end(x)
 
vector<int> parity(vector<int> source) {
    int log = sz(source) == 63 ? 6 : 8;
    vector<int> par(log, 0);
    for (int i = 0; i < sz(source); i++) {
        for (int j = 0; j < log; j++) {
            if ((i + 1) >> j & 1) par[j] ^= source[i];
        }
    }
    return par;
}
 
vector<int> get_attachment(vector<int> source) {
    vector<int> par = parity(source);
    int x = 0;
    for (int i = 0; i < sz(par); i++) {
        x ^= par[i];
    }
    par.push_back(x);
    return par;
}
 
vector<int> retrieve(vector<int> data) {
    int cut = sz(data) == 70 ? 63 : 255;
    vector<int> source(begin(data), begin(data) + cut);
    vector<int> code(begin(data) + cut, end(data));
    vector<int> par = parity(source);
    int x = 0;
    int p = 0;
    for (int i = 0; i < sz(code) - 1; i++) {
        if (code[i] != par[i]) x ^= 1 << i;
        p ^= code[i];
    }
    if (code.back() != p) return source;
    if (x != 0) source[x - 1] ^= 1;
    return source;
}

Subtask #1
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 792 KB Output is correct
2 Correct 2 ms 792 KB Output is correct
3 Correct 2 ms 796 KB Output is correct
4 Correct 3 ms 792 KB Output is correct
5 Correct 3 ms 804 KB Output is correct
6 Correct 2 ms 800 KB Output is correct
7 Correct 2 ms 792 KB Output is correct
8 Correct 2 ms 792 KB Output is correct
9 Correct 2 ms 800 KB Output is correct
10 Correct 2 ms 792 KB Output is correct
11 Correct 3 ms 792 KB Output is correct
12 Correct 2 ms 800 KB Output is correct
13 Correct 3 ms 1092 KB Output is correct
14 Correct 2 ms 792 KB Output is correct
15 Correct 2 ms 800 KB Output is correct
16 Correct 2 ms 800 KB Output is correct
17 Correct 2 ms 800 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 179 ms 2512 KB Output is correct
2 Correct 180 ms 2512 KB Output is correct
3 Correct 176 ms 2656 KB Output is correct
4 Correct 175 ms 2508 KB Output is correct
5 Correct 179 ms 2512 KB Output is correct
6 Correct 175 ms 2516 KB Output is correct
7 Correct 175 ms 2508 KB Output is correct
8 Correct 181 ms 2520 KB Output is correct
9 Correct 176 ms 2516 KB Output is correct
10 Correct 175 ms 2764 KB Output is correct
11 Correct 180 ms 2508 KB Output is correct
12 Correct 220 ms 2508 KB Output is correct
13 Correct 176 ms 2516 KB Output is correct
14 Correct 183 ms 2508 KB Output is correct
15 Correct 180 ms 2512 KB Output is correct
16 Correct 181 ms 2516 KB Output is correct
17 Correct 179 ms 2516 KB Output is correct
18 Correct 184 ms 2508 KB Output is correct
19 Correct 175 ms 2508 KB Output is correct