yukicoder contest 261 参戦記
A 1168 Digit Sum Sequence
増えていったりしないので、何も考えずに99回ループを回せば OK.
N = int(input())
for _ in range(99):
N = sum(int(c) for c in str(N))
print(N)
B 1169 Row and Column and Diagonal
解けず.
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