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Description The Little Elephant very much loves sums on intervals. This time he has a pair of integers l and r (l ≤ r). The Little Elephant has to fin 阅读全文
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Description The Little Elephant loves sortings. He has an array a consisting of n integers. Let's number the array elements from 1 to n, then the i-th 阅读全文
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Description The Little Elephant loves Ukraine very much. Most of all he loves town Rozdol (ukr. "Rozdil"). However, Rozdil is dangerous to settle, so 阅读全文