cl = (A + t - 1) // t # A÷t の小数点以下切り上げ cr = B // t # B÷t の小数点以下切り捨て ...

l = max(1, a - (K - 1)) # b, c の探索範囲の下限 l r = min(N, a + (K - 1)) # b, c の探索範囲の上限 r for b in range(l, r + 1): for c in range(l, r + 1): ...

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