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Submission #859040

# Submission time Handle Problem Language Result Execution time Memory
859040 2023-10-09T14:54:07 Z VinhLuu Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 293 ms 53296 KB 
#include <bits/stdc++.h>
#define ll long long
using namespace std;

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

string s;
int dp[Max],n,ptr;
int lt[Max],hs[Max];

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

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;
    bool f = true;
    for(int j = 1; j <= mid; j ++){
        if(get(l, l + j - 1) == get(r - j + 1, r)){
            dp[i] = max(dp[i], 2 + dfs(l + j));
            f = false;
        }
        if(f == false) break;
    }
    return dp[i];
}


void solve(){
    cin >> s;
    n = s.size();
    s = " " + s;
    for(int i = ptr; i <= n; i ++) lt[i] = (1LL * lt[i-1] * 26)%mod;
    for(int i = 1; i <= n; i ++) dp[i] = 0, hs[i] = ((1LL * hs[i - 1] * 26)%mod + (int)(s[i] - 'a'))%mod;
    cout << dfs(1) << "\n";
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    lt[0] = 1;
    ptr = 1;
    int tt; cin >> tt;
    while(tt--) solve();
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4696 KB Output is correct
2 Correct 1 ms 4456 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4696 KB Output is correct
2 Correct 1 ms 4456 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4440 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4696 KB Output is correct
2 Correct 1 ms 4456 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4440 KB Output is correct
10 Correct 3 ms 4956 KB Output is correct
11 Correct 2 ms 4700 KB Output is correct
12 Correct 3 ms 4444 KB Output is correct
13 Correct 3 ms 4700 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4696 KB Output is correct
2 Correct 1 ms 4456 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4440 KB Output is correct
10 Correct 3 ms 4956 KB Output is correct
11 Correct 2 ms 4700 KB Output is correct
12 Correct 3 ms 4444 KB Output is correct
13 Correct 3 ms 4700 KB Output is correct
14 Correct 293 ms 53296 KB Output is correct
15 Correct 144 ms 38788 KB Output is correct
16 Correct 222 ms 15724 KB Output is correct
17 Correct 146 ms 22004 KB Output is correct