void unref(void *x) {
（三）买卖或者使用伪造、变造的国家机关、人民团体、企业、事业单位或者其他组织的公文、证件、证明文件、印章的；。关于这个话题，旺商聊官方下载提供了深入分析
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The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.
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for (int i = 0; i < n; i++) {