結果

問題 No.1646 Avoid Palindrome
ユーザー 👑 obakyan
提出日時 2021-08-13 22:48:33
言語 Lua
(LuaJit 2.1.1734355927)
結果
AC  
実行時間 482 ms / 3,000 ms
コード長 2,374 bytes
コンパイル時間 238 ms
コンパイル使用メモリ 5,504 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-11-08 15:50:06
合計ジャッジ時間 13,938 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
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 * 4
other AC * 40
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 mod = 998244353
local n = io.read("*n", "*l")
local s = io.read()
local t = {}
for i = 1, n do
t[i] = s:sub(i, i)
if t[i] == "?" then
t[i] = false
else
t[i] = t[i]:byte() - 96
end
end
for i = 1, n - 1 do
if t[i] and t[i] == t[i + 1] then
print(0) os.exit()
end
end
for i = 1, n - 2 do
if t[i] and t[i] == t[i + 2] then
print(0) os.exit()
end
end
if n == 1 then
print(t[1] and 1 or 26) os.exit()
end
local dp1, dp2 = {}, {}
if not t[1] and not t[2] then
for i = 1, 26 do for j = 1, 26 do
local v = (i - 1) * 26 + j
dp1[v] = i == j and 0 or 1
end end
elseif not t[1] then
local i2 = t[2]
for i = 1, 26 do for j = 1, 26 do
local v = (i - 1) * 26 + j
if i == i2 or j ~= i2 then
dp1[v] = 0
else
dp1[v] = 1
end
end end
elseif not t[2] then
local i1 = t[1]
for i = 1, 26 do for j = 1, 26 do
local v = (i - 1) * 26 + j
if i ~= i1 or j == i1 then
dp1[v] = 0
else
dp1[v] = 1
end
end end
else
local i1 = t[1]
local i2 = t[2]
for i = 1, 26 do for j = 1, 26 do
local v = (i - 1) * 26 + j
if i ~= i1 or j ~= i2 then
dp1[v] = 0
else
dp1[v] = 1
end
end end
end
for i = 3, n do
local src = i % 2 == 1 and dp1 or dp2
local dst = i % 2 == 1 and dp2 or dp1
for j = 1, 676 do dst[j] = 0 end
if t[i] then
local z = t[i]
for prvprv = 1, 26 do
if prvprv ~= z then
for prv = 1, 26 do
if prv ~= z then
local d = (prv - 1) * 26 + z
dst[d] = dst[d] + src[(prvprv - 1) * 26 + prv]
end
end
end
end
else
local row = {}
local col = {}
for j = 1, 26 do row[j], col[j] = 0, 0 end
local all = 0
for j = 1, 26 do
for k = 1, 26 do
local sz = src[(j - 1) * 26 + k]
all = all + sz
row[j] = row[j] + sz
col[k] = col[k] + sz
end
end
local z = t[i]
for j = 1, 26 do
for prv = 1, 26 do
if prv ~= j then
local v = col[prv] - src[(j - 1) * 26 + prv]
local d = (prv - 1) * 26 + j
dst[d] = v
end
end
end
end
for j = 1, 676 do dst[j] = dst[j] % mod end
end
local tbl = n % 2 == 1 and dp2 or dp1
local ret = 0
for i = 1, 676 do
ret = ret + tbl[i]
end
print(ret % mod)
-- print(os.clock())
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