結果
問題 |
No.1382 Travel in Mitaru city
|
ユーザー |
👑 |
提出日時 | 2021-03-07 23:14:21 |
言語 | Lua (LuaJit 2.1.1734355927) |
結果 |
AC
|
実行時間 | 239 ms / 2,000 ms |
コード長 | 2,049 bytes |
コンパイル時間 | 337 ms |
コンパイル使用メモリ | 5,632 KB |
実行使用メモリ | 17,664 KB |
最終ジャッジ日時 | 2024-10-09 09:19:43 |
合計ジャッジ時間 | 11,240 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 68 |
ソースコード
local bls, brs = bit.lshift, bit.rshift local Heapq = {} Heapq.create = function(self, lt) self.lt = lt self.cnt = 0 self.t = {} end Heapq.push = function(self, v) local hqlt = self.lt local hqt = self.t local c = self.cnt + 1 self.cnt = c hqt[c] = v while 1 < c do local p = brs(c, 1) if hqlt(hqt[c], hqt[p]) then hqt[c], hqt[p] = hqt[p], hqt[c] c = p else break end end end Heapq.empty = function(self) return self.cnt == 0 end Heapq.pop = function(self) local hqlt = self.lt local hqt = self.t local ret = hqt[1] local c = self.cnt hqt[1] = hqt[c] c = c - 1 self.cnt = c local p = 1 while true do local d1, d2 = p * 2, p * 2 + 1 if c < d1 then break elseif c < d2 then if hqlt(hqt[d1], hqt[p]) then hqt[d1], hqt[p] = hqt[p], hqt[d1] end break else if hqlt(hqt[d1], hqt[d2]) then if hqlt(hqt[d1], hqt[p]) then hqt[d1], hqt[p] = hqt[p], hqt[d1] p = d1 else break end else if hqlt(hqt[d2], hqt[p]) then hqt[d2], hqt[p] = hqt[p], hqt[d2] p = d2 else break end end end end return ret end Heapq.new = function(lt) local obj = {} setmetatable(obj, {__index = Heapq}) obj:create(lt) return obj end local n, m = io.read("*n", "*n") local spos, tpos = io.read("*n", "*n") local p = {} local edge = {} local asked = {} for i = 1, n do p[i] = io.read("*n") edge[i] = {} asked[i] = false end for i = 1, m do local a, b = io.read("*n", "*n") table.insert(edge[a], b) table.insert(edge[b], a) end local function hqlt(a, b) return p[a] > p[b] end local hq = Heapq.new(hqlt) asked[spos] = true hq:push(spos) local ret = 0 local curval = p[spos] while not hq:empty() do local v = hq:pop() if p[v] < curval then ret = ret + 1 curval = p[v] end for i = 1, #edge[v] do local dst = edge[v][i] if not asked[dst] then asked[dst] = true hq:push(dst) end end end print(ret)