제출 #817518

#제출 시각아이디문제언어결과실행 시간메모리
817518BoomydayPalindromic Partitions (CEOI17_palindromic)C++17
100 / 100
2320 ms23376 KiB
// // Created by adavy on 8/9/2023. // #include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; using db = double; using str = string; // yay python! using ii = pair<int,int>; using pl = pair<ll,ll>; using pd = pair<db,db>; using vi = vector<int>; using vb = vector<bool>; using vl = vector<ll>; using vd = vector<db>; using vs = vector<str>; using vii = vector<ii>; using vpl = vector<pl>; using vpd = vector<pd>; #define tcT template<class T #define tcTU tcT, class U tcT> using V = vector<T>; tcT, size_t SZ> using AR = array<T,SZ>; tcT> using PR = pair<T,T>; // pairs #define mp make_pair #define f first #define s second #define FOR(i,a,b) for (int i = (a); i < (b); ++i) #define F0R(i,a) FOR(i,0,a) #define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i) #define R0F(i,a) ROF(i,0,a) #define trav(a,x) for (auto& a: x) #define len(x) int((x).size()) #define bg(x) begin(x) #define all(x) bg(x), end(x) #define rall(x) rbegin(x), rend(x) #define sor(x) sort(all(x)) #define rsz resize #define ins insert #define ft front() #define bk back() #define pb push_back #define eb emplace_back #define pf push_front const int MOD = 1e9+7; // 998244353; const int A = 998244353; const int MX = 2e5+5; const ll INF = 1e18; // not too close to LLONG_MAX const ld PI = acos((ld)-1); const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1}; // for every grid problem!! struct Modular { int value; static const int MOD_value = MOD; Modular(long long v = 0) { value = v % MOD; if (value < 0) value += MOD;} Modular(long long a, long long b) : value(0){ *this += a; *this /= b;} Modular& operator+=(Modular const& b) {value += b.value; if (value >= MOD) value -= MOD; return *this;} Modular& operator-=(Modular const& b) {value -= b.value; if (value < 0) value += MOD;return *this;} Modular& operator*=(Modular const& b) {value = (long long)value * b.value % MOD;return *this;} friend Modular mexp(Modular a, long long e); friend Modular inverse(Modular a) { return mexp(a, MOD - 2); } Modular& operator/=(Modular const& b) { return *this *= inverse(b); } friend Modular operator+(Modular a, Modular const b) { return a += b; } friend Modular operator-(Modular a, Modular const b) { return a -= b; } friend Modular operator-(Modular const a) { return 0 - a; } friend Modular operator*(Modular a, Modular const b) { return a *= b; } friend Modular operator/(Modular a, Modular const b) { return a /= b; } friend std::ostream& operator<<(std::ostream& os, Modular const& a) {return os << a.value;} friend bool operator==(Modular const& a, Modular const& b) {return a.value == b.value;} friend bool operator!=(Modular const& a, Modular const& b) {return a.value != b.value;} }; Modular mexp(Modular a, long long e) { Modular res = 1; while (e) { if (e&1) res *= a; a *= a; e >>= 1; } return res; } void do_test(){ string s; cin >> s; vector<Modular> hash; trav(i, s) hash.pb(i); F0R(i, s.size()){ hash[i] *= mexp(A,i); } vector<Modular> prefs = {0}; trav(i, hash) prefs.pb(prefs.back()+i); int ll=0,lr=0,rl=s.size()-1,rr=s.size()-1; int ans =0; while(1){ if (lr>=rl) { ans += 1; if (lr>rl && ll==lr) ans -= 1; break; } Modular lhash = prefs[lr+1]-prefs[ll]; Modular rhash = prefs[rr+1]-prefs[rl]; rhash /= mexp(A, rl-ll); if (lhash == rhash){ ans += 2; ll = lr+1; rr = rl-1; } lr++; rl--; } cout << ans << endl; } int main(){ std::ios::sync_with_stdio(false); cin.tie(0); int t; cin >> t; F0R(i, t) do_test(); }

컴파일 시 표준 에러 (stderr) 메시지

palindromic.cpp: In function 'void do_test()':
palindromic.cpp:42:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 | #define FOR(i,a,b) for (int i = (a); i < (b); ++i)
      |                                        ^
palindromic.cpp:43:18: note: in expansion of macro 'FOR'
   43 | #define F0R(i,a) FOR(i,0,a)
      |                  ^~~
palindromic.cpp:103:5: note: in expansion of macro 'F0R'
  103 |     F0R(i, s.size()){
      |     ^~~
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