Can you read me?
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FastIO FastIn & FastOut
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Polygon Some kind of geometry codes
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SuffixArray SuffixArray code with multi string
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QuickRangeSort Quicksort with O(N log A)
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PriorityMap PriorityQueue (==Heap) Than we can fix / update the value of items.
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OrderedMap Map which hold the values ordered by inserted. It will use std::unorderd_map.