個定g1和ig2 P k P右移 P P P左移 min maXnmin max 9/9 n n1 nmax n1 nmax q = k 3 2 2 1 i i i i  3 2 2 1 i i i i  P P P n n n ' 1 n '' 1 n ''' 1 n ''" 1 n