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35 lines
1.7 KiB
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<p>There are <code>n</code> cities. Some of them are connected, while some are not. If city <code>a</code> is connected directly with city <code>b</code>, and city <code>b</code> is connected directly with city <code>c</code>, then city <code>a</code> is connected indirectly with city <code>c</code>.</p>
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<p>A <strong>province</strong> is a group of directly or indirectly connected cities and no other cities outside of the group.</p>
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<p>You are given an <code>n x n</code> matrix <code>isConnected</code> where <code>isConnected[i][j] = 1</code> if the <code>i<sup>th</sup></code> city and the <code>j<sup>th</sup></code> city are directly connected, and <code>isConnected[i][j] = 0</code> otherwise.</p>
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<p>Return <em>the total number of <strong>provinces</strong></em>.</p>
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<p> </p>
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<p><strong class="example">Example 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>Input:</strong> isConnected = [[1,1,0],[1,1,0],[0,0,1]]
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<strong>Output:</strong> 2
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</pre>
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<p><strong class="example">Example 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>Input:</strong> isConnected = [[1,0,0],[0,1,0],[0,0,1]]
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<strong>Output:</strong> 3
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</pre>
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<p> </p>
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<p><strong>Constraints:</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> is <code>1</code> or <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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