295. Find Median from Data Stream
1143. Longest Common Subsequence
947. Most Stones Removed with Same Row or Column
215. Kth Largest Element in an Array
151. Reverse Words in a String
s.substr(cur, maxLen); //字串s索引cur數起的maxLen個字元
pair< int, int > p;
p.first; //取值,注意沒括號
p.second;