4621: P1459 [USACO2.1] 三值的排序 Sorting a Three-Valued Sequence

Memory Limit：128 MB Time Limit：1.000 S
Judge Style：Text Compare Creator：
Submit：0 Solved：0

Description

Input

Output

Sample Input Copy 

9
2
2
1
3
3
3
2
3
1

Sample Output Copy 

4

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Source/Category

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