check the B_correst for test case 3
given 3 sides, find area of this triangle
Replacing a row
If you have matrix A, create matrix B using matrix A as an "element"
Extract leading non-zero digit (★★★★★)
Reindex a vector (★★)
Median computation (★)
Sum of elements in a vector (★)
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
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