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20 lines
696 B
HTML
20 lines
696 B
HTML
<!DOCTYPE html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<h1>1049. Counting Ones (30)</h1>
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<div id="problemContent">
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<p>The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N. For example, given N being 12, there are five 1's in 1, 10, 11, and 12.</p>
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<p><b>
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Input Specification:
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</b></p>
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<p>Each input file contains one test case which gives the positive N (<=2<sup>30</sup>).</p>
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<p><b>
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Output Specification:
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</b></p>
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<p>For each test case, print the number of 1's in one line.</p>
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<b>Sample Input:</b><pre>
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12
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</pre>
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<b>Sample Output:</b><pre>
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5
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</pre>
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</div> |