|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|1 초||128 MB||16||9||9||56.250%|
FJ wants to take pictures of his N cows (2 <= N <= 1,000,000,000), which are standing in a line and conveniently numbered 1..N. Each photograph can capture a consecutive range of cows from the lineup, and FJ wants to make sure that each cow appears in at least one photo.
Unfortunately, there are K unfriendly pairs of cows (1 <= K <= 1000) that each refuse to be in the same photograph. Given the locations of these unfriendly pairs, please determine the minimum number of photos FJ needs to take.
7 3 1 3 2 4 5 6
FJ can take 3 photos: