A tool to generate QRcode
系统环境：Windows
语言标准：c++17
主程序：main.cpp
编译指令：g++ main.cpp -o main
使用方法：将文本输入input.txt（暂不支持中文），然后双击打开main.exe，生成的二维码会被输出到code.png，若内容为以http://或https://开头的有效网址，常用的二维码扫描器扫描后会自动跳转
默认使用最高纠错等级H，可以通过修改config.ini更改纠错等级：
| 纠错等级 | 容错率 | 代码 |
|---|---|---|
| 低 | 7% | L |
| 中 | 15% | M |
| 高 | 25% | Q |
| 极高 | 30% | H |
纠错等级越高，容错率越高，同时信息容量越低
RS-code采用高斯消元法计算，版本信息的BCH-code直接使用官方给出的表
二维码以png图像的形式输出，png图像生成是我以前做过的一个简单程序，可以通过RGB矩阵生成png图像
mask选择算法：以四联通相邻的相同颜色块对计数，作为估价函数，选择一个估价最小的mask，估价相同的情况下优先选择编号更大的mask
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