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200.岛屿数量.html
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200.岛屿数量.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>200. 岛屿数量</title>
</head>
<body>
<script>
// https://leetcode.cn/problems/number-of-islands/
// 给你一个由 '1'(陆地)和 '0'(水)组成的的二维网格,请你计算网格中岛屿的数量。
// 岛屿总是被水包围,并且每座岛屿只能由水平方向和/或竖直方向上相邻的陆地连接形成。
// 此外,你可以假设该网格的四条边均被水包围。
// 提示:
// m == grid.length
// n == grid[i].length
// 1 <= m, n <= 300
// grid[i][j] 的值为 '0' 或 '1'
/**
* @param {character[][]} grid
* @return {number}
*/
var numIslands = function (grid) {};
// --- answer-1 ---
var numIslands = function (grid = [[]]) {
const m = grid.length,
n = grid[0].length;
// 已访问岛屿
const visited = Array.from({ length: m }, () => Array.from({ length: n }, () => false));
let count = 0;
// 连接相邻的岛屿
function join(r, l) {
if (r >= m || r < 0 || l >= n || l < 0) return;
if (visited[r][l]) return;
visited[r][l] = true;
if (grid[r][l] === '0') return;
join(r - 1, l);
join(r + 1, l);
join(r, l - 1);
join(r, l + 1);
}
for (let i = 0; i < m; i++) {
for (let j = 0; j < n; j++) {
if (!visited[i][j] && grid[i][j] === '1') {
count += 1;
join(i, j);
}
}
}
return count;
};
// --- answer-1 ---
// --- answer-2 ---
// --- answer-2 ---
var grid = [
['1', '1', '1', '1', '0'],
['1', '1', '0', '1', '0'],
['1', '1', '0', '0', '0'],
['0', '0', '0', '0', '0']
];
var result = 1;
// var grid = [
// ['1', '1', '0', '0', '0'],
// ['1', '1', '0', '0', '0'],
// ['0', '0', '1', '0', '0'],
// ['0', '0', '0', '1', '1']
// ];
// var result = 3;
console.log('grid = ', grid);
console.log('result = ', result);
console.log('numIslands = ', numIslands(grid));
</script>
</body>
</html>