这场的状态不太好 A. Divide and Conquer 如果和为偶数,输出0 如果和为奇数,则输出最小减少奇数的步骤。如样例2, 7 / 2 = 3 , 3 / 2 = 1 , 1 / 2 = 0 7/2=3,3/2=1,1/2=0 7/2=3,3/2=1,1/2=