結果

問題 No.1439 Let's Compare!!!!
ユーザー 👑 obakyan
提出日時 2021-05-28 11:27:40
言語 Lua
(LuaJit 2.1.1734355927)
結果
AC  
実行時間 424 ms / 2,000 ms
コード長 3,373 bytes
コンパイル時間 308 ms
コンパイル使用メモリ 5,504 KB
実行使用メモリ 33,044 KB
最終ジャッジ日時 2024-11-07 01:54:50
合計ジャッジ時間 5,321 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 17
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 #
プレゼンテーションモードにする

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 = self.emptyvalue, 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", "*l")
local s_str = io.read()
local t_str = io.read()
local s = {}
local t = {}
for i = 1, n do
  s[i] = s_str:byte(i)
  t[i] = t_str:byte(i)
end
local st = SegTree.new(n, bit.bor, 0)
for i = 1, n do
  if s[i] ~= t[i] then
    st:setValue(i, 1, true)
  end
end
st:updateAll()
local q = io.read("*n", "*l")
for iq = 1, q do
  local tp, pos, val = io.read():match("(%w) (%d+) (%d+)")
  pos = tonumber(pos)
  if tp == "S" then
    s[pos] = val:byte()
  else
    t[pos] = val:byte()
  end
  if s[pos] == t[pos] then
    st:setValue(pos, 0)
  else
    st:setValue(pos, 1)
  end
  local lb = st:lower_bound(1)
  if n < lb then
    print("=")
  else
    if s[lb] < t[lb] then
      print("<")
    else
      print(">")
    end
  end
end
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