Combination.sublime-snippet

<snippet>
	<content><![CDATA[
const int M = ((int)998244353);
int power(int x, int y){
    x %= M;
    int ans = 1;
    while(y){
        if(y & 1)
            ans = (ans * x) % M;
        y >>= 1LL;
        x = (x * x) % M;
    }
    return ans;
}
int add(int a, int b){
    return((a % M + b % M) % M);
}
int sub(int a, int b){
    return((a % M - b % M + M) % M);
}
int mul(int a, int b){
    return(((a % M) * (b % M)) % M);
}
int divi(int a, int b){
    return(mul(a, power(b, M - 2)) % M);
}
const int Xn = 2e5 + 1;
int factorial[Xn],ifactorial[Xn];
void pre(){
	factorial[0] = 1;
	ifactorial[0] = 1;
	for(int i=1;i<Xn;i++){
		factorial[i] = mul(factorial[i-1],i);
		ifactorial[i] = divi(1,factorial[i]);
	}
}
int nCr(int n,int r){
	return divi(factorial[n],mul(factorial[r],factorial[n-r]));
}
]]></content>
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</snippet>