8482015 12 27123150 33 301 _2 ( ) _3 _4 _for (i = 1; i = n; i+)for (j = 1; j = n; j+)s += i * j;5 ABCDE CBADE _6 0 _7 10 _8 1 n_9 100 _10 _803 11 ABCDEFG GFEDCBA(10 )2 (10 )AB DCE F GHI KJL MN3 15 8 3 20 36 25 10(Huffman) (10 )4 45 24 53 12 37 93(10 )5(Prim) C (10 )(Kruskal) (10 )ABCDE F21 39 104 75 686 10 30 50 20 40 60(10 )(10 )3 220 401 1002 100 t 1 x x-1 x 3 3