| num | sex | age | height | weight |
1 | 1 | 12 | 159 | 13 |
2 | 2 | 5 | 123 | 51 |
3 | 1 | 6 | 156 | 35 |
4 | 2 | 1 | 59 | 1 |
5 | 2 | 56 | 12 | 38 |
6 | 1 | 95 | 51 | 1 |
7 | 1 | 32 | 315 | 351 |
8 | 2 | 4 | 13 | 8513 |
9 | 1 | 2 | 51 | 1 |
10 | 1 | 65 | 35 | 813 |
| num | grade |
1 | 1 |
1 | 2 |
1 | 4 |
2 | 2 |
2 | 3 |
3 | 4 |
3 | 1 |
3 | 2 |
4 | 2 |
5 | 3 |
5 | 1 |
5 | 4 |
5 | 5 |
6 | 2 |
6 | 3 |
6 | 1 |
7 | 4 |
7 | 5 |
7 | 2 |
7 | 3 |
8 | 4 |
8 | 5 |
8 | 1 |
8 | 5 |
8 | 2 |
8 | 3 |
9 | 1 |
9 | 4 |
9 | 2 |
10 | 3 |
10 | 1 |
实现每一个num得到一个最大值的grade;
c=
| num | sex | age | height | weight | grade |
1 | 1 | 12 | 159 | 13 | 4 |
2 | 2 | 5 | 123 | 51 | 3 |
3 | 1 | 6 | 156 | 35 | 4 |
4 | 2 | 1 | 59 | 1 | 2 |
5 | 2 | 56 | 12 | 38 | 5 |
6 | 1 | 95 | 51 | 1 | 3 |
7 | 1 | 32 | 315 | 351 | 5 |
8 | 2 | 4 | 13 | 8513 | 5 |
9 | 1 | 2 | 51 | 1 | 4 |
10 | 1 | 65 | 35 | 813 | 3 |



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