solutions and explanations
solutions and explanations
DP
1074. Number of Submatrices That Sum to Target 二维数字矩阵找 submatrix 的和为 target
解：presum，对每一行 i_end 都需要遍历 i_start in range(0, iend)，然后，遍历 col 时，可参照一维 presum 的方式。
O(row^2 * col)
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