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solution/2300-2399/2338.Count the Number of Ideal Arrays/README.md

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我们可以预处理组合数 $c[i][j]$,根据递推公式 $c[i][j]=c[i-1][j]+c[i-1][j-1]$ 求得,特别地,当 $j=0$ 时,$c[i][j]=1$。
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最终的答案为
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$$
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\sum\limits_{i=1}^{k}\sum\limits_{j=1}^{\log_2 k + 1} f[i][j] \times c_{n-1}^{j-1}
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$$

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