ACM模板库

ACM模板库


快速乘

ll qmul(ll a, ll b){
    ll sum = 0;
    while(b){
        if(b & 1)   sum = sum + a;
        while(sum >= mod)    sum -= mod;
        a = a + a;
        while(a >= mod)  a -= mod;
        b >>= 1;
    }
    return sum;
}

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