(2)
（1）三地址码：
1 i = 1
2 if i > m goto 17
3 j = 1
4 if j > n goto 15
5 t1 = i * n
6 t2 = t1 + j
7 t3 = t2 * 4
8 t4 = i * n
9 t5 = t4 + j
10 t6 = t5 * 4
11 t7 = b[t6]
12 a[t3] = t7
13 j = j + 1
14 goto 4
15 i = i + 1
16 goto 2
（2）
B1 1 i = 1
B2 2 if i > m goto 17
B3 3 j = 1
B4 4 if j > n goto 15
B5 5 t1 = i * n
6 t2 = t1 + j
7 t3 = t2 * 4
8 t4 = i * n
9 t5 = t4 + j
10 t6 = t5 * 4
11 t7 = b[t6]
12 a[t3] = t7
13 j = j + 1
14 goto 4
B6 15 i = i + 1
16 goto 2
B7
