调试中...
["StatisticsTracker","addNumber","addNumber","addNumber","addNumber","getMean","getMedian","getMode","removeFirstAddedNumber","getMode"]
[[],[4],[4],[2],[3],[],[],[],[],[]]
["StatisticsTracker","addNumber","addNumber","addNumber","addNumber","getMean","getMedian","getMode","removeFirstAddedNumber","getMode"]
[[],[4],[4],[2],[3],[],[],[],[],[]]
["StatisticsTracker","addNumber","addNumber","getMean","removeFirstAddedNumber","addNumber","addNumber","removeFirstAddedNumber","getMedian","addNumber","getMode"]
[[],[9],[5],[],[],[5],[6],[],[],[8],[]]