AtCoder ABC 004: Grid Rotation, Sequence Swaps, and Ball Distribution
Problem A
Given an integer N, output N multiplied by 2.
Problem B
Statement
Given a 4×4 grid, output the grid rotated 180 degrees.
Solution
This section focuses on permutation operations for square matrices.
In the Cartesian coordinate system, three fundamental permutations are commonly used:
Permutation f (vertical flip): h[i][j] = g[N + 1 - i ...
Posted on Sat, 07 Nov 2026 16:12:25 +0000 by Isoss