xor を二回掛けたら元に戻るので、ビット演算の出来る言語で、
値の交換の時の一時変数を省略する方法。
/* 通常のスワップ */
t = a; a = b; b = t;
/* t 省略 */
a ^= b ; b ^= a ; a ^= b ;
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