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64 lines
3.4 KiB
HTML
64 lines
3.4 KiB
HTML
<p>You are given an integer <code>n</code> and a 2D integer array <code>queries</code>.</p>
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<p>There are <code>n</code> cities numbered from <code>0</code> to <code>n - 1</code>. Initially, there is a <strong>unidirectional</strong> road from city <code>i</code> to city <code>i + 1</code> for all <code>0 <= i < n - 1</code>.</p>
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<p><code>queries[i] = [u<sub>i</sub>, v<sub>i</sub>]</code> represents the addition of a new <strong>unidirectional</strong> road from city <code>u<sub>i</sub></code> to city <code>v<sub>i</sub></code>. After each query, you need to find the <strong>length</strong> of the <strong>shortest path</strong> from city <code>0</code> to city <code>n - 1</code>.</p>
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<p>There are no two queries such that <code>queries[i][0] < queries[j][0] < queries[i][1] < queries[j][1]</code>.</p>
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<p>Return an array <code>answer</code> where for each <code>i</code> in the range <code>[0, queries.length - 1]</code>, <code>answer[i]</code> is the <em>length of the shortest path</em> from city <code>0</code> to city <code>n - 1</code> after processing the <strong>first </strong><code>i + 1</code> queries.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">n = 5, queries = [[2,4],[0,2],[0,4]]</span></p>
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<p><strong>Output:</strong> <span class="example-io">[3,2,1]</span></p>
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<p><strong>Explanation: </strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2024/06/28/image8.jpg" style="width: 350px; height: 60px;" /></p>
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<p>After the addition of the road from 2 to 4, the length of the shortest path from 0 to 4 is 3.</p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2024/06/28/image9.jpg" style="width: 350px; height: 60px;" /></p>
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<p>After the addition of the road from 0 to 2, the length of the shortest path from 0 to 4 is 2.</p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2024/06/28/image10.jpg" style="width: 350px; height: 96px;" /></p>
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<p>After the addition of the road from 0 to 4, the length of the shortest path from 0 to 4 is 1.</p>
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</div>
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<p><strong class="example">Example 2:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">n = 4, queries = [[0,3],[0,2]]</span></p>
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<p><strong>Output:</strong> <span class="example-io">[1,1]</span></p>
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<p><strong>Explanation:</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2024/06/28/image11.jpg" style="width: 300px; height: 70px;" /></p>
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<p>After the addition of the road from 0 to 3, the length of the shortest path from 0 to 3 is 1.</p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2024/06/28/image12.jpg" style="width: 300px; height: 70px;" /></p>
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<p>After the addition of the road from 0 to 2, the length of the shortest path remains 1.</p>
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</div>
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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>3 <= n <= 10<sup>5</sup></code></li>
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<li><code>1 <= queries.length <= 10<sup>5</sup></code></li>
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<li><code>queries[i].length == 2</code></li>
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<li><code>0 <= queries[i][0] < queries[i][1] < n</code></li>
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<li><code>1 < queries[i][1] - queries[i][0]</code></li>
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<li>There are no repeated roads among the queries.</li>
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<li>There are no two queries such that <code>i != j</code> and <code>queries[i][0] < queries[j][0] < queries[i][1] < queries[j][1]</code>.</li>
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</ul>
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