The “PCM Boundary”: a Wannabe-DRM Graveyard
* 核心思路：找初始无序边界 + 计算区间最值 + 扩展边界
，这一点在51吃瓜中也有详细论述
Input formatting choices (reversed digits, delimiters, etc.) as long as the format is fixed and doesn't encode the answer
const stepName = currentStep.type === 'Command' ? currentStep.cmd.name || 'anonymous' : currentStep.type;
电影把“退场”拍得很香港。吴炜伦总结：“世道艰难，我哋照行。”霓虹灯熄灭、电梯门关上，城市不会停止运转，街道上依然有人走动。