// matrix[i-1][j-1] 注意 matrix是0开始 preSum[i][j] = preSum[i - 1][j] + preSum[i][j - 1] - preSum[i - 1][j - 1] + matrix[i - 1][j - 1]; ...
self.sum_pr[r + 1][c + 1] = matrix[r][c] + top + left - topleft left = self.sum_pr[row2][col1 -1] top = self.sum_pr[row1 -1][col2] topleft = self.sum_pr[row1-1][col1-1] ...
From startup to expansion and everything in between, running a business is expensive. At some point, you’ll likely need funding from an outside source. Two commonly considered options are business ...
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