結果

問題 No.1065 電柱 / Pole (Easy)
ユーザー 👑 obakyanobakyan
提出日時 2020-11-22 15:10:02
言語 Lua
(LuaJit 2.1.1696795921)
結果
AC  
実行時間 650 ms / 2,000 ms
コード長 2,328 bytes
コンパイル時間 156 ms
コンパイル使用メモリ 5,216 KB
実行使用メモリ 39,584 KB
最終ジャッジ日時 2023-09-30 22:52:11
合計ジャッジ時間 14,422 ms
ジャッジサーバーID
(参考情報)
judge15 / judge12
このコードへのチャレンジ
(要ログイン)

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 1 ms
4,376 KB
testcase_01 AC 2 ms
4,380 KB
testcase_02 AC 297 ms
20,420 KB
testcase_03 AC 372 ms
34,576 KB
testcase_04 AC 366 ms
34,372 KB
testcase_05 AC 351 ms
34,584 KB
testcase_06 AC 349 ms
34,452 KB
testcase_07 AC 125 ms
10,756 KB
testcase_08 AC 495 ms
35,304 KB
testcase_09 AC 44 ms
5,860 KB
testcase_10 AC 219 ms
17,736 KB
testcase_11 AC 144 ms
11,632 KB
testcase_12 AC 48 ms
4,380 KB
testcase_13 AC 283 ms
21,796 KB
testcase_14 AC 332 ms
24,040 KB
testcase_15 AC 386 ms
25,048 KB
testcase_16 AC 168 ms
13,348 KB
testcase_17 AC 417 ms
26,508 KB
testcase_18 AC 119 ms
10,880 KB
testcase_19 AC 412 ms
26,204 KB
testcase_20 AC 104 ms
10,876 KB
testcase_21 AC 143 ms
12,196 KB
testcase_22 AC 366 ms
25,696 KB
testcase_23 AC 4 ms
4,376 KB
testcase_24 AC 5 ms
4,380 KB
testcase_25 AC 43 ms
4,376 KB
testcase_26 AC 193 ms
12,844 KB
testcase_27 AC 191 ms
13,280 KB
testcase_28 AC 338 ms
22,288 KB
testcase_29 AC 38 ms
4,740 KB
testcase_30 AC 385 ms
21,780 KB
testcase_31 AC 267 ms
18,120 KB
testcase_32 AC 159 ms
11,684 KB
testcase_33 AC 352 ms
20,564 KB
testcase_34 AC 120 ms
9,288 KB
testcase_35 AC 392 ms
21,984 KB
testcase_36 AC 4 ms
4,376 KB
testcase_37 AC 6 ms
4,376 KB
testcase_38 AC 4 ms
4,376 KB
testcase_39 AC 6 ms
4,380 KB
testcase_40 AC 3 ms
4,380 KB
testcase_41 AC 650 ms
39,584 KB
testcase_42 AC 158 ms
12,672 KB
testcase_43 AC 300 ms
20,852 KB
testcase_44 AC 95 ms
10,028 KB
testcase_45 AC 292 ms
20,708 KB
testcase_46 AC 1 ms
4,380 KB
testcase_47 AC 1 ms
4,376 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 #

-- use a 1D Seg class ( stage[], not stage[][])
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 = {}
  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 n, m = io.read("*n", "*n")
local x, y = io.read("*n", "*n")
local p, q = {}, {}
local edge = {}
for i = 1, n do
  p[i], q[i] = io.read("*n", "*n")
  edge[i] = {}
end
for i = 1, m do
  local s, t = io.read("*n", "*n")
  local zzz = (p[s] - p[t]) * (p[s] - p[t]) + (q[s] - q[t]) * (q[s] - q[t])
  zzz = math.sqrt(zzz)
  edge[s][t], edge[t][s] = zzz, zzz
end

local inf = 1000000007
local len = {}
local asked = {}
for i = 1, n do
  len[i] = inf
  asked[i] = false
end
len[x] = 0
asked[n + 1] = true

local function mergefunc(x, y)
  if asked[x] then return y
  elseif asked[y] then return x
  else
    return len[x] < len[y] and x or y
  end
end

local st = SegTree.new(n, mergefunc, n + 1)

for i = 1, n do
  local src = st.stage[1]
  if asked[src] then break end
  if inf <= len[src] then break end
  asked[src] = true
  st:update(src, true)
  for dst, cost in pairs(edge[src]) do
    if len[src] + cost < len[dst] then
      len[dst] = len[src] + cost
      st:update(dst)
    end
  end
end

print(len[y])
0