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用DP做的，WA，不知为什么！！！

Posted by applesun at 2008-03-10 14:34:53 on Problem 1018 
思路：设置二维动态规划数组a[i][j]表示第i种零件取第j个供应商的最佳band 和 price，其中二维数组的元素是个结构性质，保存band 和 price.
计算a[i][j]的时候就是遍历a[i-1][j]中的所有元素，取出与a[i][j]构成最优的元素，然后修改a[i][j]中的band 和 price!
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