码迷,mamicode.com
首页 > 其他好文 > 详细

463. Island Perimeter

时间:2018-01-05 21:56:39      阅读:116      评论:0      收藏:0      [点我收藏+]

标签:dimen   rmi   min   rip   color   integer   ges   ima   square   

You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is completely surrounded by water, and there is exactly one island (i.e., one or more connected land cells). The island doesn‘t have "lakes" (water inside that isn‘t connected to the water around the island). One cell is a square with side length 1. The grid is rectangular, width and height don‘t exceed 100. Determine the perimeter of the island.

Example:

[[0,1,0,0],
 [1,1,1,0],
 [0,1,0,0],
 [1,1,0,0]]

Answer: 16
Explanation: The perimeter is the 16 yellow stripes in the image below:

技术分享图片

大概意思就是求一个岛的周长

思路如下,分四个边处理,例如左边的边只有在最左边或者左边没有岛的时候可以算成周长,其余同理

public int islandPerimeter(int[][] grid) {
        int result = 0;
        for(int i=0;i<grid.length;i++)
        {
            for(int j=0;j<grid[0].length;j++)
            {
                if(grid[i][j]==0)
                {
                    continue;
                }
                else
                {
                    if(j==0||grid[i][j-1]==0)
                    {
                        result++;
                    }
                    if(i==0||grid[i-1][j]==0)
                    {
                        result++;
                    }
                     if(j==grid[0].length-1||grid[i][j+1]==0)
                    {
                        result++;
                    }
                     if(i==grid.length-1||grid[i+1][j]==0)
                    {
                        result++;
                    }
                }
            }
        }
        return result;
    }

 

463. Island Perimeter

标签:dimen   rmi   min   rip   color   integer   ges   ima   square   

原文地址:https://www.cnblogs.com/icysnow/p/8206611.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!