Submission #770925

#TimeUsernameProblemLanguageResultExecution timeMemory
770925rxlfd314Data Transfer (IOI19_transfer)C++17
60 / 100
3063 ms2488 KiB
#include "transfer.h" #include <bits/stdc++.h> using namespace std; void yeet(int n, vector<int> &v, vector<int> &source) { for (int j = 0; (1 << j) <= n; j++) { v.push_back(0); for (int i = 1; i <= n; i++) { if (i & 1 << j) { v[j] ^= source[i-1]; } } } } vector<int> get_attachment(vector<int> source) { int N = source.size(); vector<int> ret; yeet(N, ret, source); ret.push_back(0); for (int i = 0; i < N; i++) { ret.back() ^= source[i]; } return ret; } vector<int> retrieve(vector<int> data) { int N = data.size() < 255 ? 63 : 255; int M = data.size(); vector<int> test; yeet(N, test, data); if (test == vector<int>(data.begin()+N, data.begin()+M-1)) { return vector<int>(data.begin(), data.begin()+N); } bool p = 0; for (int i = 0; i < N; i++) { p ^= data[i]; } if (p ^ data[M-1]) { for (int i = 0; i < N; i++) { test.clear(); data[i] ^= 1; yeet(N, test, data); if (test == vector<int>(data.begin()+N, data.begin()+M-1)) { return vector<int>(data.begin(), data.begin()+N); } data[i] ^= 1; } } return vector<int>(data.begin(), data.begin()+N); }
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