結果
| 問題 | 
                            No.697 池の数はいくつか
                             | 
                    
| ユーザー | 
                            👑  | 
                    
| 提出日時 | 2019-05-12 13:35:57 | 
| 言語 | Lua  (LuaJit 2.1.1734355927)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 4,043 ms / 6,000 ms | 
| コード長 | 2,299 bytes | 
| コンパイル時間 | 231 ms | 
| コンパイル使用メモリ | 5,504 KB | 
| 実行使用メモリ | 19,584 KB | 
| 最終ジャッジ日時 | 2024-11-08 08:16:19 | 
| 合計ジャッジ時間 | 24,135 ms | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge4 / judge3 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 3 | 
| other | AC * 32 | 
ソースコード
local ior = io.input()
local h, w = ior:read("*n", "*n", "*l")
local function getindex(i_h, i_w)
  return i_w + (i_h - 1) * w
end
local mapbox = {}
for i = 1, math.ceil(h * w / 16) do
  mapbox[i] = 0
end
local function setval(idx, val)
  local boxidx = math.ceil(idx / 16)
  local boxval = mapbox[boxidx]
  local newval, mul = 0, 1
  local boxpos = idx % 16
  for i = 0, 15 do
    if(i == boxpos) then
      newval = newval + mul * (val % 2)
    else
      newval = newval + mul * (boxval % 2)
    end
    boxval = math.floor(boxval / 2)
    mul = mul * 2
  end
  mapbox[boxidx] = newval
end
local function getval(idx)
  local boxidx = math.ceil(idx / 16)
  local boxval = mapbox[boxidx]
  local boxpos = idx % 16
  for i = 1, boxpos do boxval = math.floor(boxval / 2) end
  return boxval % 2
end
local str = ""
for i_h = 1, h do
  str = ior:read()
  for i_w = 1, w do
    local idx = getindex(i_h, i_w)
    if(str:sub(i_w * 2 - 1, i_w * 2 - 1) == "1") then
      setval(idx, 1)
    else
      setval(idx, 0)
    end
  end
end
-- for i_h = 1, h do
--   for i_w = 1, w do
--     if(i_w ~= 1) then io.write(" ") end
--     local idx = getindex(i_h, i_w)
--     local a = getval(idx)
--     io.write(a)
--   end
--   io.write("\n")
-- end
-- os.exit()
local tasks = {}
local tasknum = 0
local done = 0
local tasklim = h + w
local function addtask(idx)
  setval(idx, 0)
  tasknum = tasknum + 1
  local taskidx = tasknum % tasklim
  if taskidx == 0 then taskidx = tasklim end
  tasks[taskidx] = idx
end
local curpos = 1
local lakecount = 0
local function searchtask()
  for i = curpos, h * w do
    if(getval(i) == 1) then
      lakecount = lakecount + 1
      curpos = i
      addtask(i)
      break
    end
  end
end
searchtask()
while(done < tasknum) do
  done = done + 1
  local taskidx = done % tasklim
  if(taskidx == 0) then taskidx = tasklim end
  local idx = tasks[taskidx]
  if(w < idx) then if(getval(idx - w) == 1) then addtask(idx - w) end end
  if(idx <= (h - 1) * w) then if(getval(idx + w) == 1) then addtask(idx + w) end end
  if(1 < w) then
    if(idx % w ~= 0) then if(getval(idx + 1) == 1) then addtask(idx + 1) end end
    if(idx % w ~= 1) then if(getval(idx - 1) == 1) then addtask(idx - 1) end end
  end
  if(done == tasknum) then
    searchtask()
  end
end
print(lakecount)