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Given an array arr, replace every element in that array with the greatest element among the elements to its right, and replace the last element with - 阅读全文
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Given the array prices where prices[i] is the price of the ith item in a shop. There is a special discount for items in the shop, if you buy the ith i 阅读全文
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Given a m * n matrix grid which is sorted in non-increasing order both row-wise and column-wise. Return the number of negative numbers in grid. 每行是不递减 阅读全文
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Given n and m which are the dimensions of a matrix initialized by zeros and given an array indices where indices[i] = [ri, ci]. For each pair of [ri, 阅读全文
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Given two integer arrays startTime and endTime and given an integer queryTime. The ith student started doing their homework at the time startTime[i] a 阅读全文