RMQ问题是指：对于长度为n的数列A，回答若干询问RMQ(A,i,j)(i,j<=n)，返回数列A中下标在[i,j]里的最小值下标。-RMQ problem is that: For the length n of the series A, in answer to several asked RMQ (A, i, j) (i, j <= n), the return of series A in the subscr ipt in [i, j] where the minimum under the subscr ipt.