Users do not control the font. A content moderator reviewing flagged usernames sees whatever font the moderation tool renders. If that tool uses a system sans-serif (Arial, Helvetica, San Francisco), Cyrillic homoglyphs are invisible. If it used Zapfino, every pair would look different. The font is an uncontrolled variable in every visual review process.
position.sort((x, y) = y - x);
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Storing a secret is one command.，推荐阅读同城约会获取更多信息
int key = arr[i]; // 待插入的元素