1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21

int RussianMul(int n, int m)
{
    int remain = 0;
    while(n != 1)
    {
        // odd
        if (n % 2 != 0)
        {
            n = (n-1)/2;
            remain += m;
            m *= 2;
        }
        // even
        else
        {
            n /= 2;
            m *= 2;
        }
    }
    return m + remain;
}