547:省份数量
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src/main/java/leetcode/editor/cn/NumberOfProvinces.java
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src/main/java/leetcode/editor/cn/NumberOfProvinces.java
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//
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//
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// 有 n 个城市,其中一些彼此相连,另一些没有相连。如果城市 a 与城市 b 直接相连,且城市 b 与城市 c 直接相连,那么城市 a 与城市 c 间接相连
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//。
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//
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// 省份 是一组直接或间接相连的城市,组内不含其他没有相连的城市。
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//
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// 给你一个 n x n 的矩阵 isConnected ,其中 isConnected[i][j] = 1 表示第 i 个城市和第 j 个城市直接相连,而
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//isConnected[i][j] = 0 表示二者不直接相连。
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//
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// 返回矩阵中 省份 的数量。
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//
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//
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//
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// 示例 1:
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//
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//
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//输入:isConnected = [[1,1,0],[1,1,0],[0,0,1]]
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//输出:2
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//
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//
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// 示例 2:
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//
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//
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//输入:isConnected = [[1,0,0],[0,1,0],[0,0,1]]
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//输出:3
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//
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//
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//
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//
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// 提示:
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//
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//
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// 1 <= n <= 200
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// n == isConnected.length
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// n == isConnected[i].length
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// isConnected[i][j] 为 1 或 0
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// isConnected[i][i] == 1
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// isConnected[i][j] == isConnected[j][i]
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//
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//
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//
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// Related Topics 深度优先搜索 广度优先搜索 并查集 图
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// 👍 595 👎 0
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package leetcode.editor.cn;
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import com.code.leet.entiy.TwoArray;
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import java.util.LinkedList;
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import java.util.Queue;
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//547:省份数量
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class NumberOfProvinces {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new NumberOfProvinces().new Solution();
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TwoArray twoArray = new TwoArray("[[1,1,0],[1,1,0],[0,0,1]]", true);
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System.out.println(solution.findCircleNum(twoArray.getArr()));
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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class Solution {
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public int findCircleNum(int[][] isConnected) {
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int length = isConnected.length;
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boolean[] use = new boolean[length];
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int count = 0;
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Queue<Integer> queue = new LinkedList<>();
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for (int i = 0; i < length; i++) {
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if (!use[i]) {
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count++;
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queue.add(i);
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use[i] = true;
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while (!queue.isEmpty()) {
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int num = queue.poll();
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for (int j = 0; j < length; j++) {
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if (isConnected[num][j] == 1 && !use[j]) {
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use[j] = true;
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queue.add(j);
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}
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}
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}
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}
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}
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return count;
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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}
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src/main/java/leetcode/editor/cn/NumberOfProvinces.md
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src/main/java/leetcode/editor/cn/NumberOfProvinces.md
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<div class="original__bRMd">
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<div>
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<p>有 <code>n</code> 个城市,其中一些彼此相连,另一些没有相连。如果城市 <code>a</code> 与城市 <code>b</code> 直接相连,且城市 <code>b</code> 与城市 <code>c</code> 直接相连,那么城市 <code>a</code> 与城市 <code>c</code> 间接相连。</p>
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<p><strong>省份</strong> 是一组直接或间接相连的城市,组内不含其他没有相连的城市。</p>
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<p>给你一个 <code>n x n</code> 的矩阵 <code>isConnected</code> ,其中 <code>isConnected[i][j] = 1</code> 表示第 <code>i</code> 个城市和第 <code>j</code> 个城市直接相连,而 <code>isConnected[i][j] = 0</code> 表示二者不直接相连。</p>
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<p>返回矩阵中 <strong>省份</strong> 的数量。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2020/12/24/graph1.jpg" style="width: 222px; height: 142px;" />
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<pre>
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<strong>输入:</strong>isConnected = [[1,1,0],[1,1,0],[0,0,1]]
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<strong>输出:</strong>2
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</pre>
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<p><strong>示例 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2020/12/24/graph2.jpg" style="width: 222px; height: 142px;" />
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<pre>
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<strong>输入:</strong>isConnected = [[1,0,0],[0,1,0],[0,0,1]]
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<strong>输出:</strong>3
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</pre>
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<p> </p>
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<p><strong>提示:</strong></p>
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<ul>
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<li><code>1 <= n <= 200</code></li>
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<li><code>n == isConnected.length</code></li>
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<li><code>n == isConnected[i].length</code></li>
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<li><code>isConnected[i][j]</code> 为 <code>1</code> 或 <code>0</code></li>
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<li><code>isConnected[i][i] == 1</code></li>
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<li><code>isConnected[i][j] == isConnected[j][i]</code></li>
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</ul>
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</div>
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</div>
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<div><div>Related Topics</div><div><li>深度优先搜索</li><li>广度优先搜索</li><li>并查集</li><li>图</li></div></div>\n<div><li>👍 595</li><li>👎 0</li></div>
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