leetcode 463. Island Perimeter 周长统计 + 暴力统计即可
2017-12-13 09:40
344 查看
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:
本题很简单,就是统计岛屿的边长,注意本题题意直接计算即可,就是一个很简单的统计即可
代码如下:
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:
本题很简单,就是统计岛屿的边长,注意本题题意直接计算即可,就是一个很简单的统计即可
代码如下:
#include <iostream> #include <vector> #include <map> #include <set> #include <queue> #include <stack> #include <string> #include <climits> #include <algorithm> #include <sstream> #include <functional> #include <bitset> #include <cmath> using namespace std; class Solution { public: int islandPerimeter(vector<vector<int>>& grid) { int sum = 0; int row = grid.size(), col = grid[0].size(); for (int i = 0; i < row; i++) { for (int j = 0; j < col; j++) { sum += calaLen(i, j, grid); } } return sum; } int calaLen(int x, int y, vector<vector<int>>& grid) { int row = grid.size(), col = grid[0].size(); if (grid[x][y] == 1) { int c = 0; if (x - 1 >= 0 && grid[x - 1][y] == 1) c++; if (x + 1 < row && grid[x + 1][y] == 1) c++; if (y - 1 >=0 && grid[x][y - 1] == 1) c++; if (y + 1 < col && grid[x][y + 1] == 1) c++; return 4 - c; } else return 0; } };
相关文章推荐
- Leetcode 463. Island Perimeter 求岛的周长 解题报告
- LeetCode 463. Island Perimeter (岛的周长)
- leetcode 463. Island Perimeter(C语言,二维数组,周长)23
- leetcode 493. Reverse Pairs 归并排序统计逆序对数量 + 这个我估计是做不出来的,还是直接暴力吧
- leetcode 520. Detect Capital 检查大小写 + 统计大写字母即可
- [Leetcode] 463. Island Perimeter 解题报告
- leetcode 463. Island Perimeter
- leetcode 463. Island Perimeter
- Leetcode 463. Island Perimeter
- [leetcode]463. Island Perimeter
- LeetCode 463. Island Perimeter
- Leetcode463. Island Perimeter
- 【leetcode】【Easy】【463. Island Perimeter】
- [leetcode: Python]463. Island Perimeter
- LeetCode-463. Island Perimeter (Java)
- LeetCode 463. Island Perimeter
- LeetCode 463. Island Perimeter
- python--leetcode463. Island Perimeter
- 463. Island Perimeter | 岛屿的周长
- LeetCode - 463. Island Perimeter - O(MN)- (C++) - 解题报告