From 38b5d05390d117cc77aba0a3026846bed32d75cd Mon Sep 17 00:00:00 2001 From: Hongfei Duan <1715106673@qq.com> Date: Tue, 8 Nov 2022 11:20:26 +0800 Subject: [PATCH 1/2] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=201254=E7=BB=9F=E8=AE=A1?= =?UTF-8?q?=E5=B0=81=E9=97=AD=E5=B2=9B=E5=B1=BF=E7=9A=84=E6=95=B0=E7=9B=AE?= =?UTF-8?q?=20js=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/1254.统计封闭岛屿的数目.md | 56 +++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/problems/1254.统计封闭岛屿的数目.md b/problems/1254.统计封闭岛屿的数目.md index b70cd496..1270085a 100644 --- a/problems/1254.统计封闭岛屿的数目.md +++ b/problems/1254.统计封闭岛屿的数目.md @@ -81,3 +81,59 @@ public: + +### 其他语言版本 + +### JavaScript: + +```js +/** + * @param {number[][]} grid + * @return {number} + */ +var closedIsland = function(grid) { + let rows = grid.length; + let cols = grid[0].length; + // 存储四个方向 + let dir = [[-1, 0], [0, -1], [1, 0], [0, 1]]; + // 深度优先 + function dfs(x, y) { + grid[x][y] = 1; + // 向四个方向遍历 + for(let i = 0; i < 4; i++) { + let nextX = x + dir[i][0]; + let nextY = y + dir[i][1]; + // 判断是否越界 + if (nextX < 0 || nextX >= rows || nextY < 0 || nextY >= cols) continue; + // 不符合条件 + if (grid[nextX][nextY] === 1) continue; + // 继续递归 + dfs(nextX, nextY); + } + } + // 从边界岛屿开始 + // 从左侧和右侧出发 + for(let i = 0; i < rows; i++) { + if (grid[i][0] === 0) dfs(i, 0); + if (grid[i][cols - 1] === 0) dfs(i, cols - 1); + } + // 从上侧和下侧出发 + for(let j = 0; j < cols; j++) { + if (grid[0][j] === 0) dfs(0, j); + if (grid[rows - 1][j] === 0) dfs(rows - 1, j); + } + let count = 0; + // 排除所有与边界相连的陆地之后 + // 依次遍历网格中的每个元素，如果遇到一个元素是陆地且状态是未访问，则遇到一个新的岛屿，将封闭岛屿的数目加 1 + // 并访问与当前陆地连接的所有陆地 + for(let i = 0; i < rows; i++) { + for(let j = 0; j < cols; j++) { + if (grid[i][j] === 0) { + count++; + dfs(i, j); + } + } + } + return count; +}; +``` From 1a854c4a7e083a5b682affe7f84ccd931b74d221 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=A8=8B=E5=BA=8F=E5=91=98Carl?= Date: Mon, 21 Nov 2022 11:47:40 +0800 Subject: [PATCH 2/2] =?UTF-8?q?Update=201254.=E7=BB=9F=E8=AE=A1=E5=B0=81?= =?UTF-8?q?=E9=97=AD=E5=B2=9B=E5=B1=BF=E7=9A=84=E6=95=B0=E7=9B=AE.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/1254.统计封闭岛屿的数目.md | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/problems/1254.统计封闭岛屿的数目.md b/problems/1254.统计封闭岛屿的数目.md index 1270085a..dc8fda41 100644 --- a/problems/1254.统计封闭岛屿的数目.md +++ b/problems/1254.统计封闭岛屿的数目.md @@ -76,13 +76,8 @@ public: return count; } }; -``` -

- - - - -### 其他语言版本 +``` +## 其他语言版本 ### JavaScript: @@ -137,3 +132,11 @@ var closedIsland = function(grid) { return count; }; ``` + + +

+ + + + +