제출 #1303372

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1303372		tdoxsanh	Palindromic Partitions (CEOI17_palindromic)	C++20	100 / 100	121 ms	35564 KiB

palindromic

#include <bits/stdc++.h>
//#include <windows.h>
//#include <conio.h>
#define N 1001001
#define M
#define CODE "SIXCUP"
#define MOD
#define MOD1 1000000007
#define MOD2 998244353
#define F first
#define S second
#define pb push_back
#define eb emplace_back
#define is insert
#define mkp make_pair
typedef int ui;
typedef long long ul;
typedef long double ud;
typedef std::pair<int,int> pii;
typedef std::pair<long long,long long> pll;
using namespace std;
constexpr int iinf=(int)1e9+7;
constexpr long long linf=(long long)1e18+7;
/// -- GLOBAL VAR --
ul T,ans;
string s;
pll hs[N],base={263,271},pw[N];
/// -- UTILS --
template<class A,class B> A maximize(A &a,const B &b)
{
   return a=a>b?a:b;
}
template<class A,class B> A minimize(A &a,const B &b)
{
   return a=a<b?a:b;
}
#ifndef MOD
template<class A,class B> void add(A &a, const B &b)
{
    a+=b;
    if(a>=MOD) a-=MOD;
}
template<class A,class B> void sub(A &a,const B &b)
{
    a-=b;
    if(a<0) a+=MOD;
}
#endif
/// -- DATA STRUCTURES --

/// -- SOLVERS --
void powCalc()
{
    pw[0].F=1;
    pw[0].S=1;
    for(ui i=1;i<N;i++)
    {
        pw[i].F=(pw[i-1].F*base.F)%MOD1;
        pw[i].S=(pw[i-1].S*base.S)%MOD2;
    }
}
void hashing()
{
    for(ui i=1;i<(ui)s.size();i++)
    {
        hs[i].F=(1LL*hs[i-1].F*base.F+(ui)s[i])%MOD1;
        hs[i].S=(1LL*hs[i-1].S*base.S+(ui)s[i])%MOD2;
    }
}
pii getHash(ui l,ui r)
{
    pii has;
    has.F=(hs[r].F-hs[l-1].F*pw[r-l+1].F+1LL*MOD1*MOD1)%MOD1;
    has.S=(hs[r].S-hs[l-1].S*pw[r-l+1].S+1LL*MOD2*MOD2)%MOD2;
    return has;
}
/// -- CHECKER --
bool AC=true;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void getRand(ui &n,ui l,ui r)
{
    uniform_int_distribution<ui> dist(l,r);
    n=dist(rng);
}
void printInput()
{

}
void comparator(ui test)
{
    vector<ui> ansA,ansB;
    cerr<<"Test case #"<<test<<": ";
    for(ui i=0;i<(ui)ansA.size();i++)
    {
        if(ansA[i]!=ansB[i])
        {
            cerr<<"Wrong answer\n";
            printInput();
            cerr<<"Test "<<i<<": Expected: '"<<ansA[i]<<"', found: '"<<ansB[i]<<"'\n";
            AC=false;
            return ;
        }
    }
    cerr<<"Accepted\n";
}
/// -- INPUT --
void read()
{
    cin>>T;
}
/// -- MAIN SOLVER --
void mainSolve()
{
    powCalc();
    while(T--)
    {
        bool ok=true;
        ans=0;
        cin>>s;
        s=" "+s;
        hashing();
        for(ui l=1,r=(ui)s.size()-1,pre1=1,pre2=(ui)s.size()-1;l<r;l++,r--)
        {
            pii hashL,hashR;
            hashL=getHash(pre1,l);
            hashR=getHash(r,pre2);
            if(hashL.F==hashR.F && hashL.S==hashR.S)
            {
                if(l==r-1) ok=false;
                pre1=l+1;
                pre2=r-1;
                ans+=2;
            }
        }
        cout<<ans+ok<<"\n";
    }
}
/// -- MAIN --
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);cout.tie(nullptr);
    #ifdef CODE
    if(fopen(CODE".INP","r"))
    {
        freopen(CODE".INP","r",stdin);
        freopen(CODE".OUT","w",stdout);
    }
    #endif // CODE
    #define __FILE_CHECK__
    #ifdef __FILE_CHECK__
    if(fopen("inp.txt","r"))
    {
       freopen("inp.txt","r",stdin);
       freopen("out.txt","w",stdout);
       freopen("ans.txt","w",stderr);
    }
    #endif // __FILE_CHECK__
    read();
    mainSolve();
    return 0;
}
/** -- DRAFT --

    -- END -- **/

컴파일 시 표준 에러 (stderr) 메시지

palindromic.cpp: In function 'int32_t main()':
palindromic.cpp:146:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  146 |         freopen(CODE".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:147:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  147 |         freopen(CODE".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:154:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  154 |        freopen("inp.txt","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:155:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  155 |        freopen("out.txt","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:156:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  156 |        freopen("ans.txt","w",stderr);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40