摘要：
1 //用list比较快 2 class Solution { 3 public String frequencySort(String s) { 4 if(s.length() == 0 || s.length() == 1) return s; 5 HashMap map = new HashMap(); 6 cha... 阅读全文
摘要：
1 class Solution { 2 public int islandPerimeter(int[][] grid) { 3 if(grid == null) return 0; 4 int row = grid.length; 5 if(row == 0) return 0; 6 int col = gr... 阅读全文