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121.Best Time to Buy and Sell StockYou are given an arraypriceswhereprices[i]is …
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871.Minimum Number of Refueling StopsHard384975Add to ListShareA car travels fro…
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13.Roman to IntegerEasy6435387Add to ListShareRoman numerals are represented by …
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136.Single NumberGiven anon-emptyarray of integersnums, every element appearstwi…
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20.Valid ParenthesesGiven a stringscontaining just the characters'(',')','{','}…
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13.Roman to IntegerRoman numerals are represented by seven different symbols:I,…