# SkyWT

#### 我们的征途是星辰大海

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✨ 最近更新：添加全站 PJAX 无刷新（220930）。

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1. 堆排序、快速排序、希尔排序、直接选择排序不是稳定的排序算法；
2. 基数排序、冒泡排序、直接插入排序、折半插入排序、归并排序是稳定的排序算法。

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$$\begin{bmatrix} x_{11} & x_{12} & x_{13} \\ x_{21} & x_{22} & x_{23} \\ x_{31} & x_{32} & x_{33} \end{bmatrix}$$

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## HDU 3555 Bomb

The counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb counts from 1 to N. If the current number sequence includes the sub-sequence "49", the power of the blast would add one point.
Now the counter-terrorist knows the number N. They want to know the final points of the power. Can you help them?

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