Codeforces 1107G 博客：https://www.cnblogs.com/tusikalanse/p/10347821.html 代码：https://codeforces.com/contest/1107/submission/49356234
Codeforces 1132G 博客：https://blog.csdn.net/yzyyylx/article/details/88222131 代码：https://codeforces.com/contest/1132/submission/51317389