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I was facing the same issue in PHP. My solution worked for 9 out of 10 test cases but timed out on one of them every time. You have to re-write the solution to be less memory intensive. In my case I was using array_shift() which re-indexes the arrays, so for large arrays it uses too much memory. My solution was to use array_reverse() and then array_pop() instead, because those methods don't re-index.