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Submission #479260

# Submission time Handle Problem Language Result Execution time Memory
479260 2021-10-11T02:19:40 Z Rainbowbunny Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 138 ms 13160 KB 
#include <bits/stdc++.h>
using namespace std;

const int MAXN = 1e6 + 5;
const int mod = 998244353;
const int P = 1823;

int Add(int x, int y, int m = mod)
{
    return x + y >= m ? x + y - m : x + y;
}

int Sub(int x, int y, int m = mod)
{
    return x - y < 0 ? x - y + m : x - y;
}

int Mul(int x, int y, int m = mod)
{  
    return 1ll * x * y % m;
}

int BinPow(int n, int k, int m = mod)
{
    int ans = 1, cur = n;
    while(k)
    {
        if(k & 1)
        {
            ans = Mul(ans, cur);
        }
        cur = Mul(cur, cur);
        k >>= 1;
    }
    return ans;
}

int t;
int pref[MAXN], pw[MAXN], ipw[MAXN];
string s;

int Get(int l, int r)
{
    return Mul(ipw[l], Sub(pref[r], l == 0 ? 0 : pref[l - 1]));
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    pw[0] = 1;
    ipw[0] = 1;
    int tmp = BinPow(P, mod - 2);
    for(int i = 1; i < MAXN; i++)
    {
        pw[i] = Mul(pw[i - 1], P);
        ipw[i] = Mul(ipw[i - 1], tmp);
    }
    cin >> t;
    while(t--)
    {
        int ans = 0;
        cin >> s;
        for(int i = 0; i < (int)s.size(); i++)
        {
            pref[i] = (i == 0 ? 0 : pref[i - 1]);
            pref[i] = Add(pref[i], Mul(pw[i], s[i] - 'a' + 1));
        }
        int l = 0, r = s.size() - 1;
        while(l <= r)
        {
            int tmpl = l;
            int tmpr = r;
            while(Get(l, tmpl) != Get(tmpr, r))
            {
                tmpl++;
                tmpr--;
            }
            if(Get(l, tmpl) == Get(tmpr, r))
            {
                if(tmpl < tmpr)
                {
                    ans += 2;
                }
                else
                {
                    ans++;
                }
                tmpl++;
                tmpr--;
            }
            l = tmpl;
            r = tmpr;
        }
        cout << ans << '\n';
    }
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8140 KB Output is correct
2 Correct 10 ms 8160 KB Output is correct
3 Correct 10 ms 8092 KB Output is correct
4 Correct 10 ms 8128 KB Output is correct
5 Correct 9 ms 8140 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8140 KB Output is correct
2 Correct 10 ms 8160 KB Output is correct
3 Correct 10 ms 8092 KB Output is correct
4 Correct 10 ms 8128 KB Output is correct
5 Correct 9 ms 8140 KB Output is correct
6 Correct 10 ms 8140 KB Output is correct
7 Correct 9 ms 8108 KB Output is correct
8 Correct 12 ms 8080 KB Output is correct
9 Correct 9 ms 8140 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8140 KB Output is correct
2 Correct 10 ms 8160 KB Output is correct
3 Correct 10 ms 8092 KB Output is correct
4 Correct 10 ms 8128 KB Output is correct
5 Correct 9 ms 8140 KB Output is correct
6 Correct 10 ms 8140 KB Output is correct
7 Correct 9 ms 8108 KB Output is correct
8 Correct 12 ms 8080 KB Output is correct
9 Correct 9 ms 8140 KB Output is correct
10 Correct 11 ms 8140 KB Output is correct
11 Correct 10 ms 8168 KB Output is correct
12 Correct 11 ms 8208 KB Output is correct
13 Correct 11 ms 8140 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8140 KB Output is correct
2 Correct 10 ms 8160 KB Output is correct
3 Correct 10 ms 8092 KB Output is correct
4 Correct 10 ms 8128 KB Output is correct
5 Correct 9 ms 8140 KB Output is correct
6 Correct 10 ms 8140 KB Output is correct
7 Correct 9 ms 8108 KB Output is correct
8 Correct 12 ms 8080 KB Output is correct
9 Correct 9 ms 8140 KB Output is correct
10 Correct 11 ms 8140 KB Output is correct
11 Correct 10 ms 8168 KB Output is correct
12 Correct 11 ms 8208 KB Output is correct
13 Correct 11 ms 8140 KB Output is correct
14 Correct 138 ms 13160 KB Output is correct
15 Correct 78 ms 13044 KB Output is correct
16 Correct 125 ms 13020 KB Output is correct
17 Correct 80 ms 10796 KB Output is correct