leetcode 2 和 c 力码每天坚持更新，从头刷起力扣算法。

解决方案难度：

  • 困难: 1

  • 简单: 2, 7, 9, 14, 20, 21, 26, 27, 28, 35, 66, 100, 101, 104, 226, 700, 747, 762

  • 中等: 3, 4, 5, 6, 8, 11, 15, 16, 17, 18, 19, 22, 24, 36, 48, 65, 78, 94, 822, 917, 951, 1038