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add leetcode problem-cn part3
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<p>给定一个整数数组 <code>arr</code>,找到 <code>min(b)</code> 的总和,其中 <code>b</code> 的范围为 <code>arr</code> 的每个(连续)子数组。</p>
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<p>由于答案可能很大,因此<strong> 返回答案模 <code>10^9 + 7</code></strong> 。</p>
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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>arr = [3,1,2,4]
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<strong>输出:</strong>17
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<strong>解释:
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</strong>子数组为<strong> </strong>[3],[1],[2],[4],[3,1],[1,2],[2,4],[3,1,2],[1,2,4],[3,1,2,4]。
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最小值为 3,1,2,4,1,1,2,1,1,1,和为 17。</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>arr = [11,81,94,43,3]
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<strong>输出:</strong>444
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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>1 <= arr.length <= 3 * 10<sup>4</sup></code></li>
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<li><code>1 <= arr[i] <= 3 * 10<sup>4</sup></code></li>
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</ul>
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<p> </p>
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