From 45b3499a20d1a415b99c2ac880aae68484657d00 Mon Sep 17 00:00:00 2001 From: Baoshuo Date: Wed, 2 Nov 2022 17:09:09 +0800 Subject: [PATCH] =?UTF-8?q?#1728.=20=E3=80=902022.11.02=20=E8=81=94?= =?UTF-8?q?=E8=80=83=E3=80=91=E5=AD=97=E7=AC=A6=E4=B8=B2=E8=BF=98=E5=8E=9F?= =?UTF-8?q?=EF=BC=88friends=EF=BC=89?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit https://sjzezoj.com/submission/63180 --- S2OJ/1728/1728.cpp | 83 ++++++++++++++++++++++++++++++++++++ S2OJ/1728/data/friends1.in | 3 ++ S2OJ/1728/data/friends1.out | 3 ++ S2OJ/1728/data/friends10.in | 3 ++ S2OJ/1728/data/friends10.out | 3 ++ S2OJ/1728/data/friends11.in | 3 ++ S2OJ/1728/data/friends11.out | 3 ++ S2OJ/1728/data/friends12.in | 3 ++ S2OJ/1728/data/friends12.out | 3 ++ S2OJ/1728/data/friends13.in | 3 ++ S2OJ/1728/data/friends13.out | 3 ++ S2OJ/1728/data/friends14.in | 3 ++ S2OJ/1728/data/friends14.out | 3 ++ S2OJ/1728/data/friends15.in | 3 ++ S2OJ/1728/data/friends15.out | 3 ++ S2OJ/1728/data/friends16.in | 3 ++ S2OJ/1728/data/friends16.out | 3 ++ S2OJ/1728/data/friends17.in | 3 ++ S2OJ/1728/data/friends17.out | 3 ++ S2OJ/1728/data/friends18.in | 3 ++ S2OJ/1728/data/friends18.out | 3 ++ S2OJ/1728/data/friends19.in | 3 ++ S2OJ/1728/data/friends19.out | 3 ++ S2OJ/1728/data/friends2.in | 3 ++ S2OJ/1728/data/friends2.out | 3 ++ S2OJ/1728/data/friends20.in | 3 ++ S2OJ/1728/data/friends20.out | 3 ++ S2OJ/1728/data/friends3.in | 3 ++ S2OJ/1728/data/friends3.out | 3 ++ S2OJ/1728/data/friends4.in | 3 ++ S2OJ/1728/data/friends4.out | 3 ++ S2OJ/1728/data/friends5.in | 3 ++ S2OJ/1728/data/friends5.out | 3 ++ S2OJ/1728/data/friends6.in | 3 ++ S2OJ/1728/data/friends6.out | 3 ++ S2OJ/1728/data/friends7.in | 3 ++ S2OJ/1728/data/friends7.out | 3 ++ S2OJ/1728/data/friends8.in | 3 ++ S2OJ/1728/data/friends8.out | 3 ++ S2OJ/1728/data/friends9.in | 3 ++ S2OJ/1728/data/friends9.out | 3 ++ S2OJ/1728/data/problem.conf | 3 ++ 42 files changed, 206 insertions(+) create mode 100644 S2OJ/1728/1728.cpp create mode 100644 S2OJ/1728/data/friends1.in create mode 100644 S2OJ/1728/data/friends1.out create mode 100644 S2OJ/1728/data/friends10.in create mode 100644 S2OJ/1728/data/friends10.out create mode 100644 S2OJ/1728/data/friends11.in create mode 100644 S2OJ/1728/data/friends11.out create mode 100644 S2OJ/1728/data/friends12.in create mode 100644 S2OJ/1728/data/friends12.out create mode 100644 S2OJ/1728/data/friends13.in create mode 100644 S2OJ/1728/data/friends13.out create mode 100644 S2OJ/1728/data/friends14.in create mode 100644 S2OJ/1728/data/friends14.out create mode 100644 S2OJ/1728/data/friends15.in create mode 100644 S2OJ/1728/data/friends15.out create mode 100644 S2OJ/1728/data/friends16.in create mode 100644 S2OJ/1728/data/friends16.out create mode 100644 S2OJ/1728/data/friends17.in create mode 100644 S2OJ/1728/data/friends17.out create mode 100644 S2OJ/1728/data/friends18.in create mode 100644 S2OJ/1728/data/friends18.out create mode 100644 S2OJ/1728/data/friends19.in create mode 100644 S2OJ/1728/data/friends19.out create mode 100644 S2OJ/1728/data/friends2.in create mode 100644 S2OJ/1728/data/friends2.out create mode 100644 S2OJ/1728/data/friends20.in create mode 100644 S2OJ/1728/data/friends20.out create mode 100644 S2OJ/1728/data/friends3.in create mode 100644 S2OJ/1728/data/friends3.out create mode 100644 S2OJ/1728/data/friends4.in create mode 100644 S2OJ/1728/data/friends4.out create mode 100644 S2OJ/1728/data/friends5.in create mode 100644 S2OJ/1728/data/friends5.out create mode 100644 S2OJ/1728/data/friends6.in create mode 100644 S2OJ/1728/data/friends6.out create mode 100644 S2OJ/1728/data/friends7.in create mode 100644 S2OJ/1728/data/friends7.out create mode 100644 S2OJ/1728/data/friends8.in create mode 100644 S2OJ/1728/data/friends8.out create mode 100644 S2OJ/1728/data/friends9.in create mode 100644 S2OJ/1728/data/friends9.out create mode 100644 S2OJ/1728/data/problem.conf diff --git a/S2OJ/1728/1728.cpp b/S2OJ/1728/1728.cpp new file mode 100644 index 00000000..8045aeab --- /dev/null +++ b/S2OJ/1728/1728.cpp @@ -0,0 +1,83 @@ +#include +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 2e6 + 5; + +class Hash { + private: + unsigned long long hash[N], p[N]; + + public: + Hash(std::string s = "", int base = 131) { + p[0] = 1; + + for (int i = 1; i <= s.size(); i++) { + hash[i] = hash[i - 1] * base + s[i - 1]; + p[i] = p[i - 1] * base; + } + } + + unsigned long long get(int l, int r) { + return hash[r] - hash[l - 1] * p[r - l + 1]; + } + + const unsigned long long &operator[](int i) const { + return p[i]; + } +}; + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + int n; + std::string u; + + cin >> n >> u; + + if (n % 2 == 0) { + cout << "NOT POSSIBLE" << endl; + + exit(0); + } + + Hash hash(u, 131); + int mid = n >> 1; + unsigned long long lst = 0; + std::string ans; + + for (int i = 1; i <= n; i++) { + if (i - 1 <= mid) { + if (hash.get(1, i - 1) * hash[mid - i + 1] + hash.get(i + 1, mid + 1) == hash.get(mid + 2, n)) { + if (lst && lst != hash.get(mid + 2, n)) { + cout << "NOT UNIQUE" << endl; + + exit(0); + } else if (!lst) { + ans = u.substr(mid + 1, mid); + lst = hash.get(mid + 2, n); + } + } + } else { + if (hash.get(1, mid) == hash.get(mid + 1, i - 1) * hash[n - i] + hash.get(i + 1, n)) { + if (lst && lst != hash.get(1, mid)) { + cout << "NOT UNIQUE" << endl; + + exit(0); + } else if (!lst) { + ans = u.substr(0, mid); + lst = hash.get(1, mid); + } + } + } + } + + cout << (ans.empty() ? "NOT POSSIBLE" : ans) << endl; + + return 0; +} diff --git a/S2OJ/1728/data/friends1.in b/S2OJ/1728/data/friends1.in new file mode 100644 index 00000000..2bacfd92 --- /dev/null +++ b/S2OJ/1728/data/friends1.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:8ea7c876dc85fd8cf83741886469d153793de380a32289083fd993161cf5f249 +size 12 diff --git a/S2OJ/1728/data/friends1.out b/S2OJ/1728/data/friends1.out new file mode 100644 index 00000000..b1e8c791 --- /dev/null +++ b/S2OJ/1728/data/friends1.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:7b7632005be0f36c5d1663a6c5ec4d13315589d65e1ef8687fb4b9866f9bc4b0 +size 5 diff --git a/S2OJ/1728/data/friends10.in b/S2OJ/1728/data/friends10.in new file mode 100644 index 00000000..48c66b5a --- /dev/null +++ b/S2OJ/1728/data/friends10.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:33a500efb5c65f2cdc8f6d6d4a377fdbb730833cf9079fec13d157d95fd4646f +size 2000010 diff --git a/S2OJ/1728/data/friends10.out b/S2OJ/1728/data/friends10.out new file mode 100644 index 00000000..168b3d7b --- /dev/null +++ b/S2OJ/1728/data/friends10.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:a9c8723f10f0b7192f8216b514b7e0e75c5e3a5d93e73473d1b4647c02b193d1 +size 1000001 diff --git a/S2OJ/1728/data/friends11.in b/S2OJ/1728/data/friends11.in new file mode 100644 index 00000000..a72178ae --- /dev/null +++ b/S2OJ/1728/data/friends11.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:7296f674d7ee7216c0cdd8a53ba2b93266ee3431e5bd9c74345e2d3b22990a67 +size 2000010 diff --git a/S2OJ/1728/data/friends11.out b/S2OJ/1728/data/friends11.out new file mode 100644 index 00000000..7e3275c3 --- /dev/null +++ b/S2OJ/1728/data/friends11.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:a2d46f633dce79ac46d9e0a8effb409c90afad6610c3ca18ac3514b1ab9c1db8 +size 1000001 diff --git a/S2OJ/1728/data/friends12.in b/S2OJ/1728/data/friends12.in new file mode 100644 index 00000000..85115322 --- /dev/null +++ b/S2OJ/1728/data/friends12.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:b63ab21c8aaf3704beb2681a5965d2336f106ec17f6fa06d98c06bc155ec7f52 +size 2000010 diff --git a/S2OJ/1728/data/friends12.out b/S2OJ/1728/data/friends12.out new file mode 100644 index 00000000..fd88ce9d --- /dev/null +++ b/S2OJ/1728/data/friends12.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:9b07d9ba24d6b47824d5be956d55016bac680110d830883d28aefea076ea8cff +size 1000001 diff --git a/S2OJ/1728/data/friends13.in b/S2OJ/1728/data/friends13.in new file mode 100644 index 00000000..50ce73db --- /dev/null +++ b/S2OJ/1728/data/friends13.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:3fab755be971347a868d57918938261874ba79a514509b46cec9a00547b06434 +size 2000010 diff --git a/S2OJ/1728/data/friends13.out b/S2OJ/1728/data/friends13.out new file mode 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