Update README.md

Author: linwt

README.md

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-编程题题解：牛客网 & leetcode力扣
+# 原题链接
+- [leetcode](https://leetcode-cn.com/problemset/algorithms/)
+- [剑指Offer](https://www.nowcoder.com/ta/coding-interviews)
+- [2017校招真题编程题汇总](https://www.nowcoder.com/ta/2017test)