实现广告主账单差异对账

solve()

Bill reconciliation:
  Total bills: 30
  Anomalies (diff > 10.0 CNY): 24
  [DIFF] ADV-001 bill=3.75 tx=6584.72 diff=-6580.97
  [DIFF] ADV-002 bill=15500.0 tx=8097.82 diff=7402.18
  [DIFF] ADV-003 bill=21000.0 tx=7500.36 diff=13499.64
  [DIFF] ADV-005 bill=19500.0 tx=380.59 diff=19119.41
  [DIFF] ADV-006 bill=17000.0 tx=2331.5 diff=14668.5
Perfect match: 6