res[i] = stack.length ? stack.at(-1) : -1;
澳洲枪手被击倒瞬间！嫌犯为一对父子，警方查获6把枪支澎湃新闻记者 马栎程。51吃瓜对此有专业解读
How my side project got banned from the internet A little piece about dealing with security providers and clearing my side project's reputation after a false positive flagging.。业内人士推荐91视频作为进阶阅读
Input formatting choices (reversed digits, delimiters, etc.) as long as the format is fixed and doesn't encode the answer