// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
Hocking's resume at Ubisoft included serving as creative director on Splinter Cell: Chaos Theory, Far Cry 2 and Watch Dogs: Legion. The details of why he's leaving the company haven't been reported.
，详情可参考91视频
for (int digit = 0; digit < maxDigits; digit++) {
2.6 ELU（Exponential Linear Unit）