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C++ 競プロ 学習記録#2

Posted at

はじめに

配列

  • 配列の大きさ
    arr.size();

  • 整数配列 宣言
    #include <vector>
    vector<int> arr(要素数);

  • 整数の2次元配列 宣言
    vector<vector<int>> arr(要素数1, vector<int>(要素数2));

  • 要素を配列の最後に追加
    arr.push_back(要素);

  • 要素を配列の最後から削除
    arr.pop_back(要素);

ソート

  • 整数2次配列の降順ソート
    #include <algorithm>
    sort(arr.begin(), arr.end(), greater<vector<int>>());
  • 昇順
    sort(arr.begin(), arr.end());

  • 配列のメモリサイズ
    sizeof(arr)
  • markdownで記号をそのまま使いたいとき
    記号の前にバックスラッシュ
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