Given that the elements in an array $arr, array are from 0 to N < = $N < = 1, find out whether there are any duplicate elements, which requires a time complexity of O (n), and a space complexity of O (1).

given that the elements in an array $arr, array are 0 to NMagi N < = $NMMI 1, find out whether there are any duplicate elements. The time complexity is O (n), and the space complexity is O (1)

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Php time-complexity search-and-replace array algorithm
Mar.09,2021

array_count_values ()?

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b34f8f-2bf65.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b34f8f-2bf65.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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