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const stack = [];

Frank’s essay provoked more emails, and this excerpt caught my attention:

。业内人士推荐搜狗输入法2026作为进阶阅读

输入：head = [2,1,5]。业内人士推荐Line官方版本下载作为进阶阅读

for (int i = n - 1; i 0; i--) {