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README.md

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 2021.6.25：
 
 DP:
-[746 最小发费爬楼梯](https://leetcode-cn.com/problems/min-cost-climbing-stairs/)
+[746 最小花费爬楼梯](https://leetcode-cn.com/problems/min-cost-climbing-stairs/)
 [198. 打家劫舍](https://leetcode-cn.com/problems/house-robber/)
 [53](https://leetcode-cn.com/problems/maximum-subarray) 
 [673.最长递增子序列的个数](https://leetcode-cn.com/problems/number-of-longest-increasing-subsequence/)