CF802B.Heidi and Library (medium)

普及/提高-

通过率：0%

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题目描述

Whereas humans nowadays read fewer and fewer books on paper, book readership among marmots has surged. Heidi has expanded the library and is now serving longer request sequences.

输入格式

Same as the easy version, but the limits have changed: $1<=n,k<=400000$ .

输出格式

Same as the easy version.

输入输出样例

输入#1
```
4 100
1 2 2 1
```
输出#1
```
2
```
输入#2
```
4 1
1 2 2 1
```
输出#2
```
3
```
输入#3
```
4 2
1 2 3 1
```
输出#3
```
3
```

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