結果
| 問題 |
No.2095 High Rise
|
| コンテスト | |
| ユーザー |
👑 |
| 提出日時 | 2022-10-08 10:36:20 |
| 言語 | Lua (LuaJit 2.1.1734355927) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 2,557 bytes |
| コンパイル時間 | 592 ms |
| コンパイル使用メモリ | 6,944 KB |
| 実行使用メモリ | 83,860 KB |
| 最終ジャッジ日時 | 2024-06-22 10:01:13 |
| 合計ジャッジ時間 | 8,284 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 19 TLE * 5 |
ソースコード
local mfl, mce = math.floor, math.ceil
local mmi, mma = math.min, math.max
local pow2 = {1}
for i = 2, 28 do pow2[i] = pow2[i - 1] * 2 end
local SegTree = {}
SegTree.updateAll = function(self)
for i = self.stagenum - 1, 1, -1 do
local cnt = pow2[i]
for j = 0, cnt - 1 do
self.stage[cnt + j] = self.func(self.stage[(cnt + j) * 2], self.stage[(cnt + j) * 2 + 1])
end
end
end
SegTree.create = function(self, n, func, emptyvalue)
self.func, self.emptyvalue = func, emptyvalue
local stagenum, mul = 1, 1
self.stage = {} -- use 1D Tree (stage[], not stage[][])
while mul < n do
mul, stagenum = mul * 2, stagenum + 1
end
self.stagenum = stagenum
for i = 1, mul * 2 - 1 do self.stage[i] = emptyvalue end
for i = 1, n do self.stage[mul + i - 1] = i end
self:updateAll()
end
SegTree.update = function(self, idx, force)
idx = idx + pow2[self.stagenum] - 1
for i = self.stagenum - 1, 1, -1 do
local dst = mfl(idx / 2)
local rem = dst * 4 + 1 - idx
self.stage[dst] = self.func(self.stage[idx], self.stage[rem])
if not force and self.stage[dst] ~= self.stage[idx] then break end
idx = dst
end
end
SegTree.new = function(n, func, emptyvalue)
local obj = {}
setmetatable(obj, {__index = SegTree})
obj:create(n, func, emptyvalue)
return obj
end
local h, w = io.read("*n", "*n")
local a = {}
for i = 1, h do
a[i] = {}
for j = 1, w do
a[i][j] = io.read("*n")
end
end
local n = h * w * 2
local len = {}
local asked = {}
for i = 1, n do
len[i] = -1
asked[i] = false
end
len[1] = 0
asked[n + 1] = true
local function mergefunc(x, y)
if asked[x] then return y
elseif asked[y] then return x
elseif len[x] < 0 then return y
elseif len[y] < 0 then return x
else
return len[x] < len[y] and x or y
end
end
local st = SegTree.new(n, mergefunc, n + 1)
local function walk(src, dst, cost)
if len[dst] < 0 or len[src] + cost < len[dst] then
len[dst] = len[src] + cost
st:update(dst)
end
end
for i = 1, n do
local src = st.stage[1]
if asked[src] then break end
if len[src] < 0 then break end
asked[src] = true
st:update(src, true)
local alt = h * w < src
local row = mce(src / w)
local col = src - (row - 1) * w
if h < row then row = row - h end
if alt then
walk(src, src - h * w, 0)
if row < h then
walk(src, src + w, a[row + 1][col])
end
else
walk(src, src + h * w, a[row][col])
if 1 < col then
walk(src, src - 1, 0)
end
if col < w then
walk(src, src + 1, 0)
end
end
end
print(len[h * w])