結果
問題 | No.979 Longest Divisor Sequence |
ユーザー | obakyan |
提出日時 | 2020-03-30 23:51:23 |
言語 | Lua (LuaJit 2.1.1696795921) |
結果 |
AC
|
実行時間 | 976 ms / 2,000 ms |
コード長 | 2,170 bytes |
コンパイル時間 | 120 ms |
コンパイル使用メモリ | 5,248 KB |
実行使用メモリ | 11,904 KB |
最終ジャッジ日時 | 2024-06-23 07:17:36 |
合計ジャッジ時間 | 2,600 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 6 ms
6,784 KB |
testcase_01 | AC | 7 ms
6,784 KB |
testcase_02 | AC | 7 ms
6,784 KB |
testcase_03 | AC | 6 ms
6,784 KB |
testcase_04 | AC | 7 ms
6,784 KB |
testcase_05 | AC | 7 ms
6,912 KB |
testcase_06 | AC | 6 ms
6,784 KB |
testcase_07 | AC | 6 ms
6,784 KB |
testcase_08 | AC | 6 ms
6,784 KB |
testcase_09 | AC | 8 ms
6,784 KB |
testcase_10 | AC | 18 ms
8,832 KB |
testcase_11 | AC | 20 ms
8,960 KB |
testcase_12 | AC | 23 ms
8,832 KB |
testcase_13 | AC | 132 ms
11,776 KB |
testcase_14 | AC | 976 ms
11,904 KB |
testcase_15 | AC | 326 ms
11,904 KB |
ソースコード
local mmi, mma = math.min, math.max local mfl, mce = math.floor, math.ceil local msq = math.sqrt local function getprimes(x) local primes = {} local allnums = {} for i = 1, x do allnums[i] = true end for i = 2, x do if allnums[i] then table.insert(primes, i) local lim = mfl(x / i) for j = 2, lim do allnums[j * i] = false end end end return primes end local function getdivisorparts(x, primes) local prime_num = #primes local tmp = {} local lim = mce(msq(x)) local primepos = 1 local dv = primes[primepos] while primepos <= prime_num and dv <= lim do if x % dv == 0 then local t = {} t.p = dv t.cnt = 1 x = x / dv while x % dv == 0 do x = x / dv t.cnt = t.cnt + 1 end table.insert(tmp, t) lim = mce(msq(x)) end if primepos == prime_num then break end primepos = primepos + 1 dv = primes[primepos] end if x ~= 1 then local t = {} t.p, t.cnt = x, 1 table.insert(tmp, t) end return tmp end local function getdivisorCore(divisorparts) local t = {} local pat = 1 local len = #divisorparts local allpat = 1 for i = 1, len do allpat = allpat * (1 + divisorparts[i].cnt) end for t_i_pat = 0, allpat - 1 do local div = allpat local i_pat = t_i_pat local ret = 1 for i = 1, len do div = mfl(div / (divisorparts[i].cnt + 1)) local mul = mfl(i_pat / div) i_pat = i_pat % div for j = 1, mul do ret = ret * divisorparts[i].p end end table.insert(t, ret) end -- table.sort(t) return t end local function getdivisor(x, primes) local dvp = getdivisorparts(x, primes) return getdivisorCore(dvp) end local n = io.read("*n") local map = {} for i = 1, 300000 do map[i] = 0 end local primes = getprimes(mce(msq(300000))) for i = 1, n do local a = io.read("*n") local facts = getdivisor(a, primes) local max = 0 for j = 1, #facts do if facts[j] ~= a then max = mma(max, map[facts[j]]) end end map[a] = mma(map[a], max + 1) end local ret = 0 for i = 1, 300000 do ret = mma(ret, map[i]) end print(ret)