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google search
Google search results:
1: https://www.geeksforgeeks.org/isro-isro-cs-2015-question-12/
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2: https://testbook.com/question-answer/a-machine-needs-a-minimum-of-100-sec-to-sort-1000--6041e22fe09a69ebc947bc88
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3: https://edurev.in/question/1802778/A-machine-needs-a-minimum-of-100-sec-to-sort-1000-
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4: https://gateoverflow.in/45338/quick-sort
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5: https://gateoverflow.in/10595/isro2015-12
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6: https://selfstudy365.com/qa/a-machine-needs-a-minimum-of-100-sec-to-sort-1000-names-by-quick-sort-5a38fb069f077b0f2aa7fd8d
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7: https://academyera.com/algorithms-sorting-3
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8: https://www.coursehero.com/file/p6ll1ar5/A-machine-needs-a-minimum-of-100-sec-to-sort-1000-names-by-quick-sortThe/
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9: https://academyera.com/isro-cs-2015-sorting
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10: https://www.frogview.com/algorithms-mcq/
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11: https://www.chegg.com/homework-help/questions-and-answers/machine-needs-minimum-100-sec-sort-1000-names-quicksort-approximate-worst-case-time-second-q60596043
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