mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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192 lines
16 KiB
JSON
192 lines
16 KiB
JSON
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"title": "Count Submatrices With All Ones",
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"For each row i, create an array nums where: if mat[i][j] == 0 then nums[j] = 0 else nums[j] = nums[j-1] +1.",
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"In the row i, number of rectangles between column j and k(inclusive) and ends in row i, is equal to SUM(min(nums[j, .. idx])) where idx go from j to k. Expected solution is O(n^3)."
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