mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-11-04 11:43:12 +08:00
102 lines
3.3 KiB
HTML
102 lines
3.3 KiB
HTML
<p>You are given an integer array <code>nums</code> of size <code>n</code>. For <strong>each</strong> index <code>i</code> where <code>0 <= i < n</code>, define a <span data-keyword="subarray-nonempty">subarray</span> <code>nums[start ... i]</code> where <code>start = max(0, i - nums[i])</code>.</p>
|
|
|
|
<p>Return the total sum of all elements from the subarray defined for each index in the array.</p>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
|
|
<div class="example-block">
|
|
<p><strong>Input:</strong> <span class="example-io">nums = [2,3,1]</span></p>
|
|
|
|
<p><strong>Output:</strong> <span class="example-io">11</span></p>
|
|
|
|
<p><strong>Explanation:</strong></p>
|
|
|
|
<table style="border: 1px solid black;">
|
|
<tbody>
|
|
<tr>
|
|
<th style="border: 1px solid black;">i</th>
|
|
<th style="border: 1px solid black;">Subarray</th>
|
|
<th style="border: 1px solid black;">Sum</th>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;">0</td>
|
|
<td style="border: 1px solid black;"><code>nums[0] = [2]</code></td>
|
|
<td style="border: 1px solid black;">2</td>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;">1</td>
|
|
<td style="border: 1px solid black;"><code>nums[0 ... 1] = [2, 3]</code></td>
|
|
<td style="border: 1px solid black;">5</td>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;">2</td>
|
|
<td style="border: 1px solid black;"><code>nums[1 ... 2] = [3, 1]</code></td>
|
|
<td style="border: 1px solid black;">4</td>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;"><strong>Total Sum</strong></td>
|
|
<td style="border: 1px solid black;"> </td>
|
|
<td style="border: 1px solid black;">11</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
|
|
<p>The total sum is 11. Hence, 11 is the output.</p>
|
|
</div>
|
|
|
|
<p><strong class="example">Example 2:</strong></p>
|
|
|
|
<div class="example-block">
|
|
<p><strong>Input:</strong> <span class="example-io">nums = [3,1,1,2]</span></p>
|
|
|
|
<p><strong>Output:</strong> <span class="example-io">13</span></p>
|
|
|
|
<p><strong>Explanation:</strong></p>
|
|
|
|
<table style="border: 1px solid black;">
|
|
<tbody>
|
|
<tr>
|
|
<th style="border: 1px solid black;">i</th>
|
|
<th style="border: 1px solid black;">Subarray</th>
|
|
<th style="border: 1px solid black;">Sum</th>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;">0</td>
|
|
<td style="border: 1px solid black;"><code>nums[0] = [3]</code></td>
|
|
<td style="border: 1px solid black;">3</td>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;">1</td>
|
|
<td style="border: 1px solid black;"><code>nums[0 ... 1] = [3, 1]</code></td>
|
|
<td style="border: 1px solid black;">4</td>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;">2</td>
|
|
<td style="border: 1px solid black;"><code>nums[1 ... 2] = [1, 1]</code></td>
|
|
<td style="border: 1px solid black;">2</td>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;">3</td>
|
|
<td style="border: 1px solid black;"><code>nums[1 ... 3] = [1, 1, 2]</code></td>
|
|
<td style="border: 1px solid black;">4</td>
|
|
</tr>
|
|
<tr>
|
|
<td style="border: 1px solid black;"><strong>Total Sum</strong></td>
|
|
<td style="border: 1px solid black;"> </td>
|
|
<td style="border: 1px solid black;">13</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
|
|
<p>The total sum is 13. Hence, 13 is the output.</p>
|
|
</div>
|
|
|
|
<p> </p>
|
|
<p><strong>Constraints:</strong></p>
|
|
|
|
<ul>
|
|
<li><code>1 <= n == nums.length <= 100</code></li>
|
|
<li><code>1 <= nums[i] <= 1000</code></li>
|
|
</ul>
|