375. Guess Number Higher or Lower II

dp[i]表示i是否能得到，初始化dp[0]为true。

遍历数组每个元素（num），对于dp中每个元素（dp[j]），如果为true，则dp[j + num] = true。

注意j必须从尾到头遍历，不然[1,2,5]会认为是true。（即每个元素num会重复累加）

转载于:https://www.cnblogs.com/co0oder/p/6986039.html

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