综合：跨区域投放效果对比分析

solve()

Cross-region impression analysis:
  天河: impressions=779 valid=779(100.0%) avg_traffic=4705.0
  朝阳: impressions=785 valid=785(100.0%) avg_traffic=4756.0
  江汉: impressions=764 valid=764(100.0%) avg_traffic=4199.0
  浦东: impressions=1234 valid=1234(100.0%) avg_traffic=5142.0
  海淀: impressions=576 valid=576(100.0%) avg_traffic=4176.0
By building type:
  commercial: 986 impressions
  hospital: 453 impressions
  hotel: 1257 impressions
  mixed: 774 impressions
  residential: 668 impressions