結果
| 問題 | No.2858 Make a Palindrome |
| ユーザー |
 kemuniku
|
| 提出日時 | 2024-08-31 00:48:47 |
| 言語 | Nim (2.0.2) |
| 結果 |
AC
|
| 実行時間 | 893 ms / 3,000 ms |
| コード長 | 11,413 bytes |
| コンパイル時間 | 4,565 ms |
| コンパイル使用メモリ | 91,936 KB |
| 実行使用メモリ | 21,428 KB |
| 最終ジャッジ日時 | 2024-08-31 00:49:06 |
| 合計ジャッジ時間 | 17,394 ms |
|
ジャッジサーバーID （参考情報） |
judge4 / judge5 |
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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 | 893 ms
10,748 KB |
| testcase_01 | AC | 228 ms
10,756 KB |
| testcase_02 | AC | 230 ms
10,760 KB |
| testcase_03 | AC | 226 ms
10,936 KB |
| testcase_04 | AC | 234 ms
10,764 KB |
| testcase_05 | AC | 219 ms
10,756 KB |
| testcase_06 | AC | 175 ms
10,836 KB |
| testcase_07 | AC | 184 ms
10,772 KB |
| testcase_08 | AC | 181 ms
10,760 KB |
| testcase_09 | AC | 177 ms
10,772 KB |
| testcase_10 | AC | 424 ms
10,876 KB |
| testcase_11 | AC | 409 ms
10,840 KB |
| testcase_12 | AC | 406 ms
11,052 KB |
| testcase_13 | AC | 428 ms
10,844 KB |
| testcase_14 | AC | 404 ms
10,876 KB |
| testcase_15 | AC | 276 ms
11,708 KB |
| testcase_16 | AC | 279 ms
11,680 KB |
| testcase_17 | AC | 300 ms
11,580 KB |
| testcase_18 | AC | 277 ms
11,896 KB |
| testcase_19 | AC | 280 ms
11,616 KB |
| testcase_20 | AC | 213 ms
18,612 KB |
| testcase_21 | AC | 216 ms
18,996 KB |
| testcase_22 | AC | 105 ms
15,028 KB |
| testcase_23 | AC | 202 ms
18,592 KB |
| testcase_24 | AC | 180 ms
17,628 KB |
| testcase_25 | AC | 169 ms
17,800 KB |
| testcase_26 | AC | 160 ms
17,528 KB |
| testcase_27 | AC | 236 ms
19,412 KB |
| testcase_28 | AC | 178 ms
17,224 KB |
| testcase_29 | AC | 214 ms
18,936 KB |
| testcase_30 | AC | 232 ms
19,544 KB |
| testcase_31 | AC | 226 ms
19,540 KB |
| testcase_32 | AC | 186 ms
19,500 KB |
| testcase_33 | AC | 253 ms
19,632 KB |
| testcase_34 | AC | 226 ms
19,476 KB |
| testcase_35 | AC | 228 ms
19,536 KB |
| testcase_36 | AC | 246 ms
19,752 KB |
| testcase_37 | AC | 228 ms
21,428 KB |
| testcase_38 | AC | 262 ms
19,472 KB |
| testcase_39 | AC | 237 ms
19,496 KB |
ソースコード
import macros;macro ImportExpand(s:untyped):untyped = parseStmt($s[2])
import macros
ImportExpand "cplib/tmpl/sheep.nim" <=== "when not declared CPLIB_TMPL_SHEEP:\n const CPLIB_TMPL_SHEEP* = 1\n {.warning[UnusedImport]: off.}\n {.hint[XDeclaredButNotUsed]: off.}\n import algorithm\n import sequtils\n import tables\n import macros\n import math\n import sets\n import strutils\n import strformat\n import sugar\n import heapqueue\n import streams\n import deques\n import bitops\n import std/lenientops\n import options\n #入力系\n proc scanf(formatstr: cstring){.header: \"<stdio.h>\", varargs.}\n proc getchar(): char {.importc: \"getchar_unlocked\", header: \"<stdio.h>\", discardable.}\n proc ii(): int {.inline.} = scanf(\"%lld\\n\", addr result)\n proc lii(N: int): seq[int] {.inline.} = newSeqWith(N, ii())\n proc si(): string {.inline.} =\n result = \"\"\n var c: char\n while true:\n c = getchar()\n if c == ' ' or c == '\\n':\n break\n result &= c\n #chmin,chmax\n template `max=`(x, y) = x = max(x, y)\n template `min=`(x, y) = x = min(x, y)\n #bit演算\n proc `%`*(x: int, y: int): int =\n result = x mod y\n if y > 0 and result < 0: result += y\n if y < 0 and result > 0: result += y\n proc `//`*(x: int, y: int): int{.inline.} =\n result = x div y\n if y > 0 and result * y > x: result -= 1\n if y < 0 and result * y < x: result -= 1\n proc `%=`(x: var int, y: int): void = x = x%y\n proc `//=`(x: var int, y: int): void = x = x//y\n proc `**`(x: int, y: int): int = x^y\n proc `**=`(x: var int, y: int): void = x = x^y\n proc `^`(x: int, y: int): int = x xor y\n proc `|`(x: int, y: int): int = x or y\n proc `&`(x: int, y: int): int = x and y\n proc `>>`(x: int, y: int): int = x shr y\n proc `<<`(x: int, y: int): int = x shl y\n proc `~`(x: int): int = not x\n proc `^=`(x: var int, y: int): void = x = x ^ y\n proc `&=`(x: var int, y: int): void = x = x & y\n proc `|=`(x: var int, y: int): void = x = x | y\n proc `>>=`(x: var int, y: int): void = x = x >> y\n proc `<<=`(x: var int, y: int): void = x = x << y\n proc `[]`(x: int, n: int): bool = (x and (1 shl n)) != 0\n #便利な変換\n proc `!`(x: char, a = '0'): int = int(x)-int(a)\n #定数\n #[ include cplib/utils/constants ]#\n when not declared CPLIB_UTILS_CONSTANTS:\n const CPLIB_UTILS_CONSTANTS* = 1\n const INF32*: int32 = 100100111.int32\n const INF64*: int = int(3300300300300300491)\n const INF = INF64\n #converter\n\n #range\n iterator range(start: int, ends: int, step: int): int =\n var i = start\n if step < 0:\n while i > ends:\n yield i\n i += step\n elif step > 0:\n while i < ends:\n yield i\n i += step\n iterator range(ends: int): int = (for i in 0..<ends: yield i)\n iterator range(start: int, ends: int): int = (for i in\n start..<ends: yield i)\n\n #joinが非stringでめちゃくちゃ遅いやつのパッチ\n proc join*[T: not string](a: openArray[T], sep: string = \"\"): string = a.mapit($it).join(sep)\n"
ImportExpand "cplib/str/hash_string.nim" <=== "when not declared CPLIB_STR_HASHSTRING:\n const CPLIB_STR_HASHSTRING* = 1\n import random\n type HashString* =object\n hash* :uint\n bpow :uint\n size: int\n const MASK30 = (1u shl 30) - 1\n const MASK31 = (1u shl 31) - 1\n const RH_MOD = (1u shl 61) - 1\n const POW_CALC = 500000\n\n randomize()\n\n proc calc_mod(x: uint): uint =\n result = (x shr 61) + (x and RH_MOD)\n if result >= RH_MOD:\n result -= RH_MOD\n\n proc mul(a, b: uint): uint =\n let\n a_upper = a shr 31\n a_lower = a and MASK31\n b_upper = b shr 31\n b_lower = b and MASK31\n mid = a_lower * b_upper + a_upper * b_lower\n mid_upper = mid shr 30\n mid_lower = mid and MASK30\n result = a_upper * b_upper * 2 + mid_upper + (mid_lower shl 31) + a_lower * b_lower\n\n\n proc inner_pow(a:uint, n: int): uint =\n var a = a\n var n = n\n result = 1\n while n > 0:\n if (n and 1) != 0:\n result = mul(result, a).calc_mod\n a = mul(a, a).calc_mod\n n = n shr 1\n\n let hashstring_base:uint = rand(129u..(1u shl 30))\n let inv_hashstring_base:uint = inner_pow(hashstring_base,int(RH_MOD)-2)\n var pows : seq[uint] = newseq[uint](POW_CALC+1)\n var invpows : seq[uint] = newseq[uint](POW_CALC+1)\n pows[0] = 1\n invpows[0] = 1\n for i in 1..POW_CALC:\n pows[i] = (mul(pows[i-1],hashstring_base).calc_mod)\n invpows[i] = (mul(invpows[i-1],inv_hashstring_base).calc_mod)\n\n proc base_pow(n:int):uint=\n if n >= len(pows):\n return inner_pow(hashstring_base,n)\n else:\n return pows[n]\n\n proc tohash*(S:string):HashString=\n var hash = 0u\n var tmp = 1u\n for i in countdown(len(S)-1,0,1):\n hash = (hash+mul(uint(int(S[i])),tmp)).calc_mod\n tmp = mul(tmp,hashstring_base).calc_mod \n result = HashString(hash:hash,bpow:base_pow(len(S)),size:len(S))\n\n proc tohash*(S:char):HashString=\n result = HashString(hash:uint(int(S)),bpow:hashstring_base,size:1)\n\n proc `&`*(L,R:HashString):HashString=\n result = HashString(hash:(mul(L.hash,R.bpow).calc_mod+R.hash).calc_mod,bpow:mul(L.bpow,R.bpow).calc_mod,size:L.size+R.size)\n\n proc `==`*(L,R:HashString):bool=\n return (L.size == R.size) and (L.hash == R.hash)\n\n proc len*(H:HashString):int=int(H.size)\n\n proc `*`*(H:HashString,x:int):HashString=\n var\n size = H.size * x\n bpow = uint(1)\n tmp_hash = H.hash\n tmp_b = H.bpow\n hash = uint(0)\n x = x\n while x > 0:\n if x mod 2 != 0:\n hash = (mul(hash,tmp_b).calc_mod+tmp_hash).calc_mod\n bpow = mul(bpow,tmp_b).calc_mod\n if x > 1:\n tmp_hash = (mul(tmp_hash,tmp_b).calc_mod+tmp_hash).calc_mod\n tmp_b = mul(tmp_b,tmp_b).calc_mod\n x = x shr 1\n return HashString(hash:hash,bpow:bpow,size:size)\n\n proc removePrefix*(H,prefix:HashString):HashString=\n var hash = (H.hash + (RH_MOD - mul(prefix.hash,base_pow(len(H)-len(prefix))).calc_mod)).calc_mod\n var l = len(H)-len(prefix)\n #TODO:bpowのlogを消したい\n return HashString(hash:hash,bpow:base_pow(l),size:l)\n\n type RollingHashBase = ref object\n S : string\n prefixs : seq[uint]\n size : int \n\n type RollingHash* = object\n R : RollingHashBase\n l : int\n r : int\n\n proc len*(S:RollingHashBase):int=\n return int(S.size)\n\n proc len*(S:RollingHash):int=\n return int(S.r-S.l)\n\n proc get_substring(R:RollingHashBase,l,r:int):RollingHash=\n # 半開区間とする。\n # 空文字列用にr=0も許容していることに注意。\n # 空文字列はl=0,r=0のみ許容している。\n assert l in 0..<R.size and r in 0..R.size and (l < r or (l == 0 and r == 0))\n result.R = R\n result.l = l\n result.r = r\n\n proc `[]`*(R:RollingHashBase,slice:HSlice[int,int]):RollingHash=\n assert slice.a >= 0 and slice.b >= 0\n return R.get_substring(slice.a,slice.b+1)\n\n\n proc `[]`*(S:RollingHash,slice:HSlice[int,int]):RollingHash=\n if len(slice) == 0:\n return S.R.get_substring(0,0)\n assert slice.a in 0..<len(S) and slice.b in 0..<len(S)\n return S.R.get_substring(S.l+slice.a,S.l+slice.b+1)\n\n proc gethash(S:RollingHash,slice:HSlice[int,int]):uint=\n return (S.R.prefixs[(S.l+slice.b+1)] + (RH_MOD - mul(S.R.prefixs[S.l+slice.a],base_pow(((S.l+slice.b+1)-(S.l+slice.a)))).calc_mod)).calc_mod\n\n\n proc `[]`*(S:RollingHash,idx:int):char=\n return S.R.S[idx+int(S.l)]\n\n proc initRollingHash*(S:string):RollingHash=\n var rolling = RollingHashBase()\n rolling.S = S\n rolling.prefixs = newSeq[uint](len(S)+1)\n rolling.prefixs[0] = 0\n for i in 1..len(S):\n rolling.prefixs[i] = (mul(rolling.prefixs[i-1],hashstring_base) + uint(int(S[i-1]))).calc_mod()\n rolling.size = (len(S))\n return rolling[0..<len(S)]\n\n\n\n converter toHashString*(self:RollingHash):HashString=\n return HashString(hash:(self.R.prefixs[self.r] + (RH_MOD - mul(self.R.prefixs[self.l],base_pow(self.r-self.l)).calc_mod)).calc_mod,bpow:base_pow(self.r-self.l),size:self.r-self.l)\n\n proc`$`*(S:RollingHash):string=\n return S.R.S[S.l..<S.r]\n\n proc `==`*(S,T:RollingHash):bool=\n return len(S) == len(T) and (S.R.prefixs[S.r] + (RH_MOD - mul(S.R.prefixs[S.l],base_pow(S.r-S.l)).calc_mod)).calc_mod == \n (T.R.prefixs[T.r] + (RH_MOD - mul(T.R.prefixs[T.l],base_pow(T.r-T.l)).calc_mod)).calc_mod\n\n proc LCP*(S,T:RollingHash):int=\n var ok = 0\n var ng = min(len(S),len(T))+1\n while ng-ok > 1:\n var mid = (ok + ng) div 2\n if S.gethash(0..<mid) == T.gethash(0..<mid): ok = mid\n else: ng = mid\n return ok\n\n proc cmp*(S,T:RollingHash):int=\n var S = S\n var T = T\n var flg = 1\n if len(S) > len(T):\n swap(S,T)\n flg *= -1\n var lcp = LCP(S,T)\n if len(S) == lcp:\n if len(S) == len(T):\n return 0\n else:\n return -1*flg\n else:\n if S[lcp] < T[lcp]:\n return -1*flg\n else:\n return flg\n\n proc `<`*(S,T:RollingHash):bool=\n return cmp(S,T) < 0\n"
var T = ii()
for _ in range(T):
var N,M = ii()
var S = si()
#Sを無限個連結した文字列について、
#1.あるiからM文字連続のものが回文かを判定する。
#2.あるiからM+1文字連続のものが回文かをはんていする。
var ans = INF
var HS = S.initRollingHash()
var HRS = (reversed(S).join("")).initRollingHash()
proc solve(i,x:int):bool=
if (i+x) < N:
return HS[i..<(i+x)] == HRS[(N-1-(i+x-1))..(N-1-i)]
var tmp1 = HS[i..<N].toHashString()
var tmp2 = HRS[0..(N-1-i)].toHashString()
#echo (i,x)
# echo (tmp1,tmp2,HS[i..<N],HS[0..(N-1-i)])
tmp1 = tmp1 & (HS * ((x-len(i..<N)) // N))
tmp2 = (HRS * ((x-len(i..<N)) // N)) & tmp2
#echo (tmp1,tmp2)
var nokori = x-(((x-len(i..<N)) // N)*N + len(i..<N))
#echo nokori
tmp1 = tmp1 & HS[0..<nokori]
tmp2 = HRS[(N-nokori)..(N-1)] & tmp2
#echo (tmp1,tmp2)
return tmp1 == tmp2
for i in range(N):
#echo (i,solve(i,M),solve(i,M+1))
if solve(i,M):
ans.min = (M-(N-i)+(N-1))//N + 1
if solve(i,M+1):
ans.min = (M+1-(N-i)+(N-1))//N + 1
if ans == INF:
echo -1
else:
echo ans