Method
helper2
�ⷨ2:DP dp���̣�f(n) = { 0 ; ��n=0 1 + min{f(n-Ci)}; ��n>0 ע:nΪ��CiΪӲ����ֵ��iΪ��ֵ������ ʱ�临�Ӷ�O(n*amount),nΪӲ������ �ռ临�Ӷ�O(amount) *****/
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Callers
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Tested by
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