refactor 677

Author: fishercoder1534

README.md

@@ -323,7 +323,7 @@ _If you like this project, please leave me a star._ ★
 |680|[Valid Palindrome II](https://leetcode.com/problems/valid-palindrome-ii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_680.java) |  |Easy | String
 |679|[24 Game](https://leetcode.com/problems/24-game/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_679.java) |  |Hard | Recursion
 |678|[Valid Parenthesis String](https://leetcode.com/problems/valid-parenthesis-string/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_678.java) |  |Medium| Recursion, Greedy
-|677|[Map Sum Pairs](https://leetcode.com/problems/map-sum-pairs/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_677.java) |  |Medium | HashMap
+|677|[Map Sum Pairs](https://leetcode.com/problems/map-sum-pairs/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_677.java) |  |Medium | HashMap, Trie
 |676|[Implement Magic Dictionary](https://leetcode.com/problems/implement-magic-dictionary/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_676.java) | | Medium |
 |675|[Cut Off Trees for Golf Event](https://leetcode.com/problems/cut-off-trees-for-golf-event/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_675.java) |  |Hard | BFS
 |674|[Longest Continuous Increasing Subsequence](https://leetcode.com/problems/longest-continuous-increasing-subsequence/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_674.java) |  |Easy |