作业3：PSP记录耗时情况
| PSP2.1 | Personal Software Process Stage | Time |
| planning | 计划 | 10min |
| Estimate | 估计这个任务多久完成 | 150min |
| Developing | 开发 | 30min |
| Analysis | 需求分析 | 15min |
| Coding Standard | 代码规范 | 20min |
| Coding | 具体编码 | 25miin |
| Code Review | 代码复审 | 15min |
| Test | 测试 | 15min |
| Reporting | 报告 | 15min |
| Design | 具体设计 | 10min |
| Postmortem&Report | 总结&报告 | 30min |
