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66 lines
2.8 KiB
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66 lines
2.8 KiB
HTML
<p>You are given an integer array <code>nums</code> of length <code>n</code> and a 2D array <code>queries</code> where <code>queries[i] = [l<sub>i</sub>, r<sub>i</sub>]</code>.</p>
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<p>Each <code>queries[i]</code> represents the following action on <code>nums</code>:</p>
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<ul>
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<li>Decrement the value at each index in the range <code>[l<sub>i</sub>, r<sub>i</sub>]</code> in <code>nums</code> by <strong>at most</strong><strong> </strong>1.</li>
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<li>The amount by which the value is decremented can be chosen <strong>independently</strong> for each index.</li>
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</ul>
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<p>A <strong>Zero Array</strong> is an array with all its elements equal to 0.</p>
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<p>Return the <strong>maximum </strong>number of elements that can be removed from <code>queries</code>, such that <code>nums</code> can still be converted to a <strong>zero array</strong> using the <em>remaining</em> queries. If it is not possible to convert <code>nums</code> to a <strong>zero array</strong>, return -1.</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">nums = [2,0,2], queries = [[0,2],[0,2],[1,1]]</span></p>
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<p><strong>Output:</strong> <span class="example-io">1</span></p>
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<p><strong>Explanation:</strong></p>
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<p>After removing <code>queries[2]</code>, <code>nums</code> can still be converted to a zero array.</p>
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<ul>
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<li>Using <code>queries[0]</code>, decrement <code>nums[0]</code> and <code>nums[2]</code> by 1 and <code>nums[1]</code> by 0.</li>
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<li>Using <code>queries[1]</code>, decrement <code>nums[0]</code> and <code>nums[2]</code> by 1 and <code>nums[1]</code> by 0.</li>
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</ul>
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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">nums = [1,1,1,1], queries = [[1,3],[0,2],[1,3],[1,2]]</span></p>
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<p><strong>Output:</strong> <span class="example-io">2</span></p>
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<p><strong>Explanation:</strong></p>
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<p>We can remove <code>queries[2]</code> and <code>queries[3]</code>.</p>
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</div>
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<p><strong class="example">Example 3:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">nums = [1,2,3,4], queries = [[0,3]]</span></p>
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<p><strong>Output:</strong> <span class="example-io">-1</span></p>
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<p><strong>Explanation:</strong></p>
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<p><code>nums</code> cannot be converted to a zero array even after using all the queries.</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>1 <= nums.length <= 10<sup>5</sup></code></li>
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<li><code>0 <= nums[i] <= 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 <= l<sub>i</sub> <= r<sub>i</sub> < nums.length</code></li>
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</ul>
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