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+/1 1⍉{x+1⍉+.×⍵}⍣×⍣(⎕-1)⊢x←⌽∘⍨⌽∘.≤⍨⍳1+⎕
Try it online!Try it online!
A full program which takes N, then M as inputs.
Follows the same algorithm as xnor's Python solution.
-6 bytes from Bubbler.
+/1 1⍉{x+.×⍵}⍣(⎕-1)⊢x←⌽∘.≤⍨⍳1+⎕
Try it online!
+/1 1⍉+.×⍣(⎕-1)⍨⌽∘.≤⍨⍳1+⎕
