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40 lines
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40 lines
1.3 KiB
HTML
<p>给你四个整数数组 <code>nums1</code>、<code>nums2</code>、<code>nums3</code> 和 <code>nums4</code> ，数组长度都是 <code>n</code> ，请你计算有多少个元组 <code>(i, j, k, l)</code> 能满足：</p>
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<ul>
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<li><code>0 <= i, j, k, l < n</code></li>
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<li><code>nums1[i] + nums2[j] + nums3[k] + nums4[l] == 0</code></li>
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</ul>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>nums1 = [1,2], nums2 = [-2,-1], nums3 = [-1,2], nums4 = [0,2]
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<strong>输出：</strong>2
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<strong>解释：</strong>
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两个元组如下：
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1. (0, 0, 0, 1) -> nums1[0] + nums2[0] + nums3[0] + nums4[1] = 1 + (-2) + (-1) + 2 = 0
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2. (1, 1, 0, 0) -> nums1[1] + nums2[1] + nums3[0] + nums4[0] = 2 + (-1) + (-1) + 0 = 0
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>nums1 = [0], nums2 = [0], nums3 = [0], nums4 = [0]
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<strong>输出：</strong>1
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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>n == nums1.length</code></li>
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<li><code>n == nums2.length</code></li>
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<li><code>n == nums3.length</code></li>
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<li><code>n == nums4.length</code></li>
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<li><code>1 <= n <= 200</code></li>
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<li><code>-2<sup>28</sup> <= nums1[i], nums2[i], nums3[i], nums4[i] <= 2<sup>28</sup></code></li>
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</ul>
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