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45 lines
1.5 KiB
HTML
45 lines
1.5 KiB
HTML
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<p>给你一个仅由数字 0 - 9 组成的字符串 <code>num</code>。如果偶数下标处的数字之和等于奇数下标处的数字之和，则认为该数字字符串是一个 <b>平衡字符串</b>。</p>
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<p>如果 <code>num</code> 是一个 <strong>平衡字符串</strong>，则返回 <code>true</code>；否则，返回 <code>false</code>。</p>
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<p> </p>
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<p><strong class="example">示例 1：</strong></p>
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<div class="example-block">
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<p><strong>输入：</strong>num<span class="example-io"> = "1234"</span></p>
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<p><strong>输出：</strong><span class="example-io">false</span></p>
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<p><strong>解释：</strong></p>
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<ul>
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<li>偶数下标处的数字之和为 <code>1 + 3 = 4</code>，奇数下标处的数字之和为 <code>2 + 4 = 6</code>。</li>
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<li>由于 4 不等于 6，<code>num</code> 不是平衡字符串。</li>
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</ul>
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</div>
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<p><strong class="example">示例 2：</strong></p>
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<div class="example-block">
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<p><strong>输入：</strong>num<span class="example-io"> = "24123"</span></p>
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<p><strong>输出：</strong>true</p>
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<p><strong>解释：</strong></p>
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<ul>
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<li>偶数下标处的数字之和为 <code>2 + 1 + 3 = 6</code>，奇数下标处的数字之和为 <code>4 + 2 = 6</code>。</li>
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<li>由于两者相等，<code>num</code> 是平衡字符串。</li>
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</ul>
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</div>
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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>2 <= num.length <= 100</code></li>
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<li><code>num</code> 仅由数字 0 - 9 组成。</li>
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</ul>
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