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	add leetcode problem-cn part1
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<p>Given a string <code>date</code> representing a <a href="https://en.wikipedia.org/wiki/Gregorian_calendar" target="_blank">Gregorian calendar</a> date formatted as <code>YYYY-MM-DD</code>, return <em>the day number of the year</em>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> date = "2019-01-09"
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<strong>Output:</strong> 9
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<strong>Explanation:</strong> Given date is the 9th day of the year in 2019.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> date = "2019-02-10"
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<strong>Output:</strong> 41
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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><code>date.length == 10</code></li>
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	<li><code>date[4] == date[7] == '-'</code>, and all other <code>date[i]</code>'s are digits</li>
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	<li><code>date</code> represents a calendar date between Jan 1<sup>st</sup>, 1900 and Dec 31<sup>th</sup>, 2019.</li>
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</ul>
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