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Submission #858992

# Submission time Handle Problem Language Result Execution time Memory
858992 2023-10-09T14:12:39 Z VinhLuu Palindromic Partitions (CEOI17_palindromic) C++14
60 / 100
 559 ms 131072 KB 
#include <bits/stdc++.h>
#define ll long long
using namespace std;

const ll mod = 1e9 + 7;
const int Max = 1e6 + 5;
const ll dm = 998244353;

string s[Max];
int dp[Max],n;
ll lt[Max],hs[Max],t[Max],pw[Max];

int get(int i,int j){
    return (hs[j]%mod + mod - (1LL * hs[i - 1]*lt[j - i + 1])%mod)%mod;
}

int got(int i,int j){
    return (t[j]%dm + dm - (1LL * t[i - 1]*pw[j - i + 1])%dm)%dm;
}

int dfs(int i){
    if(dp[i] != 0) return dp[i];
    dp[i] = 1;
    int l = i, r = n - i + 1;
    if(l > r) return dp[i] = 0;
    if(l == r) return dp[i] = 1;
    int mid = (r - l + 1) / 2;
    for(int j = 1; j <= mid; j ++){
        if(get(l, l + j - 1) == get(r - j + 1, r) && got(l, l + j - 1) == got(r - j + 1, r)){
            dp[i] = max(dp[i], 2 + dfs(l + j));
        }
    }
    return dp[i];
}


void solve(int c){
    n = s[c].size();
    s[c] = " " + s[c];
    for(int i = 1; i <= n; i ++){
        dp[i] = 0;
        hs[i] = ((1LL * hs[i - 1] * 26)%mod + (int)(s[c][i] - 'a'))%mod;
        t[i] = ((1LL * t[i - 1] * 26)%dm + (int)(s[c][i] - 'a'))%dm;
    }
    cout << dfs(1) << "\n";
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int tt; cin >> tt;
    int mx = 0;
    for(int i = 1; i <= tt; i ++){
        cin >> s[i];
        mx = max(mx,(int)s[i].size());
    }
    lt[0] = 1;
    pw[0] = 1;
    for(int i = 1; i <= mx; i ++) lt[i] = (1LL * lt[i-1] * 26)%mod, pw[i] = (1LL * pw[i - 1] * 26)%dm;
    for(int i = 1; i <= tt; i ++) solve(i);
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 35932 KB Output is correct
2 Correct 7 ms 35928 KB Output is correct
3 Correct 7 ms 35932 KB Output is correct
4 Correct 8 ms 35932 KB Output is correct
5 Correct 7 ms 35892 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 35932 KB Output is correct
2 Correct 7 ms 35928 KB Output is correct
3 Correct 7 ms 35932 KB Output is correct
4 Correct 8 ms 35932 KB Output is correct
5 Correct 7 ms 35892 KB Output is correct
6 Correct 7 ms 35932 KB Output is correct
7 Correct 7 ms 35928 KB Output is correct
8 Correct 7 ms 35928 KB Output is correct
9 Correct 8 ms 36188 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 35932 KB Output is correct
2 Correct 7 ms 35928 KB Output is correct
3 Correct 7 ms 35932 KB Output is correct
4 Correct 8 ms 35932 KB Output is correct
5 Correct 7 ms 35892 KB Output is correct
6 Correct 7 ms 35932 KB Output is correct
7 Correct 7 ms 35928 KB Output is correct
8 Correct 7 ms 35928 KB Output is correct
9 Correct 8 ms 36188 KB Output is correct
10 Correct 559 ms 36960 KB Output is correct
11 Correct 68 ms 36632 KB Output is correct
12 Correct 17 ms 36440 KB Output is correct
13 Correct 295 ms 36584 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 35932 KB Output is correct
2 Correct 7 ms 35928 KB Output is correct
3 Correct 7 ms 35932 KB Output is correct
4 Correct 8 ms 35932 KB Output is correct
5 Correct 7 ms 35892 KB Output is correct
6 Correct 7 ms 35932 KB Output is correct
7 Correct 7 ms 35928 KB Output is correct
8 Correct 7 ms 35928 KB Output is correct
9 Correct 8 ms 36188 KB Output is correct
10 Correct 559 ms 36960 KB Output is correct
11 Correct 68 ms 36632 KB Output is correct
12 Correct 17 ms 36440 KB Output is correct
13 Correct 295 ms 36584 KB Output is correct
14 Runtime error 76 ms 131072 KB Execution killed with signal 9
15 Halted 0 ms 0 KB -