mth_invFactorial.sublime-snippet

<snippet>
	<content><![CDATA[
// inverse factorial computation
const int MAXN = 2*1e5+1;
lint factorial[MAXN];
lint inverse_fac[MAXN];
void factInverse()
{
    factorial[0]=1;
    for(lint i=1;i<MAXN;i++)
    {
        factorial[i]=(factorial[i-1]*i)%MOD;
    }
    inverse_fac[MAXN-1]=modInverse(factorial[MAXN-1],MOD);
    for(lint i=MAXN-2;i>=0;i--)
    {
        inverse_fac[i]=(inverse_fac[i+1]*(i+1))%MOD;
    }
    return;
}
]]></content>
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