Submission #1344635

#	Time	Username	Problem	Language	Result	Execution time	Memory
1344635		killerzaluu	Data Transfer (IOI19_transfer)	C++20	60 / 100	69 ms	1724 KiB

transfer

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

int find_n_from_total(int m) {
    for (int s = 1; 2 * s <= m; s++) {
        int n = m - 2 * s;
        if (n < 0) continue;
        int t = 1;
        while (t * t < n) t++;
        if (t == s) return n;
    }
    return -1;
}

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

    int s = 1;
    while (s * s < n) s++;

    vector<int> row(s, 0), col(s, 0);

    for (int i = 0; i < n; i++) {
        int r = i / s;
        int c = i % s;
        row[r] ^= source[i];
        col[c] ^= source[i];
    }

    vector<int> ans;
    for (int i = 0; i < s; i++) ans.push_back(row[i]);
    for (int i = 0; i < s; i++) ans.push_back(col[i]);

    return ans;
}

vector<int> retrieve(vector<int> data) {
    int m = data.size();
    int n = find_n_from_total(m);

    int s = 1;
    while (s * s < n) s++;

    vector<int> row(s, 0), col(s, 0);

    for (int i = 0; i < n; i++) {
        int r = i / s;
        int c = i % s;
        row[r] ^= data[i];
        col[c] ^= data[i];
    }

    int badr = -1, badc = -1;
    int cnt = 0;

    for (int i = 0; i < s; i++) {
        if (row[i] != data[n + i]) {
            badr = i;
            cnt++;
        }
    }

    for (int i = 0; i < s; i++) {
        if (col[i] != data[n + s + i]) {
            badc = i;
            cnt++;
        }
    }

    vector<int> ans;
    for (int i = 0; i < n; i++) ans.push_back(data[i]);

    if (cnt == 2 && badr != -1 && badc != -1) {
        int pos = badr * s + badc;
        if (pos < n) ans[pos] ^= 1;
    }

    return ans;
}

Compilation message (stderr)

grader.cpp: In instantiation of 'void shuffle(std::vector<T>&) [with T = Scenario]':
grader.cpp:200:10:   required from here
grader.cpp:28:23: warning: 'void std::random_shuffle(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<Scenario*, vector<Scenario> >]' is deprecated: use 'std::shuffle' instead [-Wdeprecated-declarations]
   28 |         random_shuffle(v.begin(), v.end());
      |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/algorithm:61,
                 from grader.cpp:8:
/usr/include/c++/13/bits/stl_algo.h:4581:5: note: declared here
 4581 |     random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~~~~~~~~~~~

• Subtask 1: 36 / 60
• Subtask 2: 24 / 40