优势：时间复杂度O(n+k)，k为数据范围
valToGreater2.set(cur, stack2.length ? stack2.at(-1) : -1);
，更多细节参见91视频
Moves to look for a new provider started in September 2023, but in the interim, spending continued to rise.
城市表情时间：12月23日地点：建国门场景：一只喜鹊飞过冬天的枝桠。新京报记者 薛珺 摄SourcePh" style="display:none"
while (stack.length && stack.at(-1) <= cur) {