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@Gettei(すぱ げってぃ)

競プロ日記#25/05/06

Posted at

アルゴ式

Q8. スイッチクエリ (2)

  • スイッチのoffについて思いつかなかったので勉強になった
// (S = S & ~(1 << x))でSのxビット目を0にすることができる。
// 1 << xはxビット目が1でそれ以外が0の数を表す。
// 1 << xのビットを反転させるとxビット目が0でそれ以外が1の数になる。
if (flag == 1){
    (S = S & ~(1 << x));
}

Ex. XOR の意味

  • A XOR B = CのときA XOR C = Bになる
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