综合：广告主多源数据账单对账

solve()

Multi-source reconciliation:
  ADV-001: bill_cost=3.75 tx=6584.72 diff=-6580.97 [DIFF]
  ADV-002: bill_cost=15500.0 tx=8097.82 diff=7402.18 [DIFF]
  ADV-003: bill_cost=21000.0 tx=7500.36 diff=13499.64 [DIFF]
  ADV-004: bill_cost=3.88 tx=0.0 diff=3.88 [MATCH]
  ADV-005: bill_cost=19500.0 tx=380.59 diff=19119.41 [DIFF]
  ADV-006: bill_cost=17000.0 tx=2331.5 diff=14668.5 [DIFF]
Anomalies: 24