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You replace the element with 'X' while iterating, and again whn you are checking the previous element with [j-1] , if it is 'X' it will check if your element is greater than 'X'., so you should check if your [j-1] or [i-1] is 'X' or not. Just add this to your if statement.
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You replace the element with 'X' while iterating, and again whn you are checking the previous element with [j-1] , if it is 'X' it will check if your element is greater than 'X'., so you should check if your [j-1] or [i-1] is 'X' or not. Just add this to your if statement.