ShahariarIslam's blog

sort and reverse
By ShahariarIslam, history, 9 months ago, In English

sort(v.begin(),v.end(),greater ()); OR sort(v.rbegin(),v.rend()); OR sort(v.begin(),v.end()); reverse(v.begin(),v.end()); All these are the same

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9 months ago, # |
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9 months ago, # |
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ok but i perfer sort(v.rbegin(), v.rend());

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6 months ago, # |
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6 months ago, # |
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seek help

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6 months ago, # |
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They all have a time complexity O(n log n), in the sorting process the first one uses the greater<int>() comparator to sort in descending order based on this criterion while the second one uses reverse iterators instead of the comparator. But the third one actually adds a small constant factor because of the reversing, making the time complexity combined of O(n log n) + O(n) which is still O(n log n) overall but makes the first and the second methods slightly more efficient than it

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