leetcode Number of Islands
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题目链接
思路:
广度优先搜索
代码
public class Solution { public int numIslands(char[][] grid) { int count=0; for(int i=0;i<grid.length;i++) { for(int j=0;j<grid[0].length;j++) { if(grid[i][j]=='1') { count++; dfs(grid, i, j); } } } return count; } public void dfs(char[][]grid,int rowIndex,int columIndex) { if(rowIndex<0||rowIndex>grid.length-1) { return; } if(columIndex<0||columIndex>grid[0].length-1) { return; } if(grid[rowIndex][columIndex]=='0') { return; } grid[rowIndex][columIndex]='0'; dfs(grid,rowIndex-1,columIndex); dfs(grid,rowIndex+1,columIndex); dfs(grid, rowIndex, columIndex-1); dfs(grid, rowIndex, columIndex+1); return; }}
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