The Interview -- best scene# Movie - 无限影话
r*t
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You are given N blocks of height 1…N. In how many ways can you arrange
these blocks in a row such that when viewed from left you see only L blocks
(rest are hidden by taller blocks) and when seen from right you see only R
blocks? Example given N=3, L=2, R=1 there is only one arrangement {2, 1, 3}
while for N=3, L=2, R=2 there are two ways {1, 3, 2} and {2, 3, 1}.
these blocks in a row such that when viewed from left you see only L blocks
(rest are hidden by taller blocks) and when seen from right you see only R
blocks? Example given N=3, L=2, R=1 there is only one arrangement {2, 1, 3}
while for N=3, L=2, R=2 there are two ways {1, 3, 2} and {2, 3, 1}.
