So, you’re looking to get better at coding interviews, huh? Maybe you’ve heard about LeetCode and feel a bit lost. It’s ...
- Precompute a table P where P[r][c] = sum of matrix[0..r][0..c]. - Then any sub-rectangle sum can be answered in O(1) using inclusion–exclusion: sum(row1..row2 ...
if(i==0 && j==0) dp[i][j] = grid[i][j]; else if(i==0) dp[i][j] = grid[i][j] + dp[i][j-1]; else if(j==0) dp[i][j] = grid[i][j] + dp[i-1][j]; else dp[i][j] = grid[i][j ...
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