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37 lines
2.0 KiB
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37 lines
2.0 KiB
HTML
<p>Given a string <code>expression</code> representing an expression of fraction addition and subtraction, return the calculation result in string format.</p>
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<p>The final result should be an <a href="https://en.wikipedia.org/wiki/Irreducible_fraction" target="_blank">irreducible fraction</a>. If your final result is an integer, change it to the format of a fraction that has a denominator <code>1</code>. So in this case, <code>2</code> should be converted to <code>2/1</code>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> expression = "-1/2+1/2"
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<strong>Output:</strong> "0/1"
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> expression = "-1/2+1/2+1/3"
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<strong>Output:</strong> "1/3"
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> expression = "1/3-1/2"
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<strong>Output:</strong> "-1/6"
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</pre>
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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>The input string only contains <code>'0'</code> to <code>'9'</code>, <code>'/'</code>, <code>'+'</code> and <code>'-'</code>. So does the output.</li>
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<li>Each fraction (input and output) has the format <code>±numerator/denominator</code>. If the first input fraction or the output is positive, then <code>'+'</code> will be omitted.</li>
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<li>The input only contains valid <strong>irreducible fractions</strong>, where the <strong>numerator</strong> and <strong>denominator</strong> of each fraction will always be in the range <code>[1, 10]</code>. If the denominator is <code>1</code>, it means this fraction is actually an integer in a fraction format defined above.</li>
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<li>The number of given fractions will be in the range <code>[1, 10]</code>.</li>
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<li>The numerator and denominator of the <strong>final result</strong> are guaranteed to be valid and in the range of <strong>32-bit</strong> int.</li>
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</ul>
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