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    //³ý·¨
    public static int chufa(int a,int b){
        
        if(a<b){
            return 0;
        }
        
        int t = 1;
        int sum = b;
        while((sum+sum)<=a){
            sum += sum;
            t += t;
        }
        return t+chufa(a-sum,b);
    }

תÔØÓÚ:https://www.cnblogs.com/wkcode/p/10418572.html