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题目： A 2d grid map of m rows and n columns is initially filled with water. We may perform an addLand operation which turns the water at position (row, 阅读全文
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题目：Given a 2D matrixmatrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1,col1) and lower right corner (row... 阅读全文
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题目： Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Note: 链接： http://leetcode.com/probl 阅读全文
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题目：An image is represented by a binary matrix with0as a white pixel and1as a black pixel. The black pixels are connected, i.e., there is only one blac... 阅读全文