enesoncu's blog

What the hell is this doing?
By enesoncu, 9 years ago, In English

I saw this in TopCoder. But I can't understand what the f array show.

f[1][1] = 1;
for( i,2,n )
    for( j,1,i )
        f[i][j] = f[i-1][j-1] + j*f[i-1][j];

Is it Mathematical function? Can someone help?

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9 years ago, # |
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Stirling numbers II

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9 years ago, # |
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for(j,1,i) means for (int j=1; j<i; ++j) or with j<=i? And how f is initialised — everything in zeros?

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9 years ago, # |
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Such an absolutely wrong manner to ask questions.

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