// 复制剩余元素（只需复制左数组剩余，右数组已在原位置）
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，更多细节参见搜狗输入法2026
arr[j + gap] = arr[j];。业内人士推荐im钱包官方下载作为进阶阅读
stack.pop(); // 弹出无效候选值，推荐阅读夫子获取更多信息