Submission #973172

#TimeUsernameProblemLanguageResultExecution timeMemory
973172sleepntsheepData Transfer (IOI19_transfer)C++14
0 / 100
4 ms2504 KiB
#include "transfer.h" std::vector<int> get_attachment(std::vector<int> source) { int xorsum = 0; std::vector<int> v; for (int i = 0; i < (int)source.size(); ++i) if (source[i]) xorsum ^= i; for (int i = 0; i < 8; ++i) v.push_back((xorsum>>i)&1); v.push_back(__builtin_parity(xorsum)); return v; } std::vector<int> retrieve(std::vector<int> data) { int xorsum = 0; int n = (int)data.size() - 9; for (int i = 0; i < n; ++i) if (data[i]) xorsum ^= i; int xordat = 0; for (int i = n; i < n + 8; ++i) if (data[i]) xordat ^= (1<<(i-n)); while (data.size() > n) data.pop_back(); if (__builtin_parity(xordat) != data.back()) return data; int i = xorsum ^ xordat; data[i] ^= 1; return data; }

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:22:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |     while (data.size() > n) data.pop_back();
      |            ~~~~~~~~~~~~^~~
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