結果

問題 No.1188 レベルX門松列
ユーザー 👑 obakyanobakyan
提出日時 2022-02-01 23:17:35
言語 Lua
(LuaJit 2.1.1696795921)
結果
AC  
実行時間 232 ms / 2,000 ms
コード長 3,951 bytes
コンパイル時間 42 ms
コンパイル使用メモリ 5,376 KB
実行使用メモリ 12,288 KB
最終ジャッジ日時 2024-06-11 09:15:19
合計ジャッジ時間 3,693 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
このコードへのチャレンジ
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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 112 ms
12,160 KB
testcase_01 AC 200 ms
12,160 KB
testcase_02 AC 176 ms
12,160 KB
testcase_03 AC 232 ms
12,160 KB
testcase_04 AC 212 ms
12,160 KB
testcase_05 AC 0 ms
5,376 KB
testcase_06 AC 106 ms
12,160 KB
testcase_07 AC 200 ms
12,160 KB
testcase_08 AC 194 ms
12,160 KB
testcase_09 AC 1 ms
5,376 KB
testcase_10 AC 3 ms
5,376 KB
testcase_11 AC 18 ms
5,376 KB
testcase_12 AC 21 ms
5,376 KB
testcase_13 AC 21 ms
5,376 KB
testcase_14 AC 128 ms
7,552 KB
testcase_15 AC 227 ms
12,288 KB
testcase_16 AC 5 ms
5,376 KB
testcase_17 AC 175 ms
12,160 KB
testcase_18 AC 3 ms
5,376 KB
testcase_19 AC 164 ms
12,160 KB
testcase_20 AC 1 ms
5,376 KB
testcase_21 AC 2 ms
5,376 KB
testcase_22 AC 1 ms
5,376 KB
testcase_23 AC 2 ms
5,376 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

local mfl, mce = math.floor, math.ceil
local mmi, mma = math.min, math.max
local bls, brs = bit.lshift, bit.rshift
local SegTree = {}
SegTree.updateAll = function(self)
  for i = self.stagenum - 1, 1, -1 do
    local cnt = bls(1, i - 1)
    for j = 1, cnt do
      self.stage[i][j] = self.func(self.stage[i + 1][j * 2 - 1], self.stage[i + 1][j * 2])
    end
  end
end
SegTree.create = function(self, n, func, emptyvalue)
  self.func, self.emptyvalue = func, emptyvalue
  local stagenum, mul = 1, 1
  self.stage = {{}}
  while mul < n do
    mul, stagenum = mul * 2, stagenum + 1
    self.stage[stagenum] = {}
  end
  self.stagenum = stagenum
  self.left_stage = {}
  for i = 1, n do
    local sp, sz = 1, bls(1, stagenum - 1)
    while(i - 1) % sz ~= 0 do
      sp, sz = sp + 1, brs(sz, 1)
    end
    self.left_stage[i] = sp
  end
  self.sz_stage = {}
  local tmp, sp = 1, stagenum
  for i = 1, n do
    if tmp * 2 == i then tmp, sp = tmp * 2, sp - 1 end
    self.sz_stage[i] = sp
  end
  for i = 1, mul do self.stage[stagenum][i] = emptyvalue end
  self:updateAll()
end
SegTree.getRange = function(self, left, right)
  if left == right then return self.stage[self.stagenum][left] end
  local stagenum = self.stagenum
  local ret = self.emptyvalue
  while left <= right do
    local stage = mma(self.left_stage[left], self.sz_stage[right - left + 1])
    local sz = bls(1, stagenum - stage)
    ret = self.func(ret, self.stage[stage][1 + brs(left - 1, stagenum - stage)])
    left = left + sz
  end
  return ret
end
SegTree.update = function(self, idx)
  for i = self.stagenum - 1, 1, -1 do
    local dst = brs(idx + 1, 1)
    local rem = dst * 4 - 1 - idx
    self.stage[i][dst] = self.func(self.stage[i + 1][idx], self.stage[i + 1][rem])
    idx = dst
  end
end
SegTree.setValue = function(self, idx, value, silent)
  self.stage[self.stagenum][idx] = value
  if not silent then
    self:update(idx)
  end
end
SegTree.lower_bound = function(self, val)
  local ret, retpos = -1000000007, 0
  local stagenum = self.stagenum
  local stage, l, r = 1, 1, bls(1, stagenum - 1)
  while true do
    local sz = bls(1, stagenum - stage)
    local tmp = self.func(ret, self.stage[stage][mce(l / sz)])
    if tmp < val then
      ret, retpos = tmp, l + sz - 1
      if l + sz <= r then stage, l = stage + 1, l + sz
      else break
      end
    else
      if sz ~= 1 then stage, r = stage + 1, l + sz - 2
      else break
      end
    end
  end
  return retpos + 1
end
SegTree.new = function(n, func, emptyvalue)
  local obj = {}
  setmetatable(obj, {__index = SegTree})
  obj:create(n, func, emptyvalue)
  return obj
end
local n = io.read("*n")
local inf = 1000000007
local st = SegTree.new(n, mma, inf)
local a = {}
for i = 1, n do a[i] = io.read("*n") end
local leftplus = {}
for i = 1, n do
  local ai = a[i]
  local pos = st:lower_bound(ai)
  leftplus[i] = pos
  if ai < st:getRange(pos, pos) then
    st:setValue(pos, ai)
  end
end
local leftminus = {}
for i = 1, n do
  st:setValue(i, inf, true)
end
st:updateAll()
for i = 1, n do
  local ai = -a[i]
  local pos = st:lower_bound(ai)
  leftminus[i] = pos
  if ai < st:getRange(pos, pos) then
    st:setValue(pos, ai)
  end
end
local rightplus = {}
for i = 1, n do
  rightplus[i] = 0
  st:setValue(i, inf, true)
end
st:updateAll()
for i = n, 1, -1 do
  local ai = a[i]
  local pos = st:lower_bound(ai)
  rightplus[i] = pos
  if ai < st:getRange(pos, pos) then
    st:setValue(pos, ai)
  end
end
local rightminus = {}
for i = 1, n do
  rightminus[i] = 0
  st:setValue(i, inf, true)
end
st:updateAll()
for i = n, 1, -1 do
  local ai = -a[i]
  local pos = st:lower_bound(ai)
  rightminus[i] = pos
  if ai < st:getRange(pos, pos) then
    st:setValue(pos, ai)
  end
end
local ret = 0
for i = 1, n do
  -- print(i, leftplus[i], rightplus[i], leftminus[i], rightminus[i])
  local v1 = mmi(leftplus[i], rightplus[i]) - 1
  local v2 = mmi(leftminus[i], rightminus[i]) - 1
  ret = mma(ret, v1, v2)
end
print(ret)
0