# SkyWT

## 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?

## gdb 调试的使用

Linux 下没有 Dev-cpp，每次遇到想要调试的代码就是坠痛苦的。所以我们还是得学点 gdb 调试的命令。

## C++ 终极时间优化模板

$10^9$ 级别居然都可以压过去！！！