Submission #164439

#	Time	Username	Problem	Language	Result	Execution time	Memory
164439		kungfulon	Palindromic Partitions (CEOI17_palindromic)	C++14	0 / 100	3 ms	1144 KiB

palindromic

///Phạm Nguyễn Tuấn Hoàng///
#include <bits/stdc++.h>
#define rep(i,a,b) for(int i = (a);i <= (b);i++)
#define repd(i,a,b) for(int i = (a);i >= (b);i--)
#define F first
#define S second
#define PB push_back
#define Task ""
using namespace std;
//template <class T> inline read(T &a){a = 0;char c;bool nega = 0;while(!isdigit(c = getchar()) && c != '-');if(c == '-') nega = 1,c = getchar();a = c - 48;while(isdigit(c = getchar()))a = a * 10 + c - 48;if(nega) a = -a;}
//template <class T> inline writep(T a){if(a > 9) writep(a / 10);putchar(a % 10 + 48);}
//template <class T> inline write(T a){if(a < 0) putchar('-'),a = -a;writep(a);putchar(' ');}
//template <class T> inline writeln(T a){write(a);putchar('\n');}
const int base = 1000000007;
unsigned long long Hash[100012],h[100012];

int main()
{
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
//    freopen(Task".inp","r",stdin);
//    freopen(Task".out","w",stdout);
    h[0] = 1;
    rep(i,1,100000) h[i] = h[i-1] * base;

    int T;
    cin >> T;
    while(T--)
    {
        string s;
        cin >> s;
        int n = s.size();
        s = ' ' + s;
        int End = n,Begin = 1,cnt = 0,lastEnd = n + 1;
        vector<int> df(27),ds(27);
        while(End > Begin)
        {
            bool check = 1;
            Hash[Begin] = Hash[Begin - 1] * base + s[Begin];
            Hash[End] = Hash[End + 1] + h[lastEnd - End - 1] * s[End];
            if(Hash[End] != Hash[Begin]) check = 0;
            if(check)
            {
                cnt += 2;
                rep(i,0,'z' - 'a') df[i] = ds[i] = 0;
                lastEnd = End;
                Hash[Begin] = Hash[End] = 0;
            }
            End--,Begin++;
        }
        cout << cnt + (lastEnd != Begin) << '\n';
    }
    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 20
• Subtask 3: 0 / 25
• Subtask 4: 0 / 40