HBC24076怕npy的小宝[USACO 2017 Feb S]Why Did the Cow Cross the Road II题解

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The long road through Farmer John's farm hasNcrosswalks across it, conveniently numbered1…N. To allow cows to cross at these crosswalks, FJ installs electric crossing signals, which light up with a green cow icon when it is ok for the cow to cross, and red otherwise. Unfortunately, a large electrical storm has damaged some of his signals. Given a list of the damaged signals, please compute the minimum number of signals that FJ needs to repair in order for there to exist some contiguous block of at leastKworking signals.

The long road through Farmer John's farm has N crosswalks across it, conveniently numbered 1…N (1≤N≤100,000). To allow cows to cross at these crosswalks, FJ installs electric crossing signals, which light up with a green cow icon when it is ok for the cow to cross, and red otherwise. Unfortunately, a large electrical storm has damaged some of his signals. Given a list of the damaged signals, please compute the minimum number of signals that FJ needs to repair in order for there to exist some contiguous block of at least K working signals.

标签： HBC24076怕npy的小宝[USACO 2017 Feb S]Why Did the Cow Cross the Road II题解