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Good Sequences
1.
Good Sequences (Div1 B,
Div2 D) DEGwer
2.
問題概要 • good sequenceとは、狭義単調増加な自然数列で
どの隣り合う2項も互いに素でないものとします • 10^5以下の自然数からなる集合が与えられます • すべての要素がこの集合に含まれるようなgood sequenceのうち最長のものの長さを求めてくだ さい
3.
想定TLE解法 • DP • dp[i]を自然数iを最後に使ったときのgood
sequenceの最大長としてDP • dp[k]を求めるのにdp[1]からdp[k-1]までのうち GCD(k,i)!=1であるようなdp[i]の最大値を求める 必要がある
4.
想定TLE解法 • dp[k]を求めるのに最大で10^5個の組のGCDを
求めなければいけない • これを10^5回繰り返す • n=10^5としてO(n^2 log n) • TLE
5.
想定解法 • やはりDP • ただし、先ほどとはちょっと違うDP
6.
想定解法 • newdp[k]をkを約数にもつような自然数iに対す
るdp[i]の最大値と定義 • dp[k]を計算するときは、kがiの倍数であるよう なiに対してnewdp[i]の最大値をとって1をたす • その後、そのnewdp[i]たちをdp[k]の値で埋める
7.
想定解法 • ぱっと見O(n^2) • しかし実は、1からnまでの約数の個数の総和は
ならしでO(n log n) ▫ 各約数ごとに、1からnまでにそれぞれn/2,n/3…回 ずつ現れる ▫ これは調和級数 • よって、DPは全体でO(n log n)で処理できる! • 約数を求めるところも同様にO(n log n)で前処理 できる
8.
コーナーケース • 与えられた集合が{1}の場合、答えは1 ▫
約数でDPするとどこにも属さない • pretestに入ってる
9.
Statastics • First acceptance:
Petr
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