請使用 branch & bound 策略解決 0/1 背包問題。
- 第一行包含兩個正整數
- 背包大小 ≤5×10^6
- 物品個數 ≤1000
- 下一行開始每行包含兩個正整數
- 物品價值 ≤10^5
- 物品重量 ≤10^5
- 請輸出最大收益
請使用 branch & bound 策略,其餘作法(e.g. dynamic programming)不予計分。
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