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Submission #859038

# Submission time Handle Problem Language Result Execution time Memory
859038 2023-10-09T14:53:32 Z VinhLuu Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 292 ms 53192 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 4440 KB Output is correct
2 Correct 1 ms 4444 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 4440 KB Output is correct
2 Correct 1 ms 4444 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 4440 KB Output is correct
7 Correct 1 ms 4456 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4444 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 4440 KB Output is correct
7 Correct 1 ms 4456 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 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 4440 KB Output is correct
2 Correct 1 ms 4444 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 4440 KB Output is correct
7 Correct 1 ms 4456 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 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 292 ms 53192 KB Output is correct
15 Correct 146 ms 38932 KB Output is correct
16 Correct 219 ms 15648 KB Output is correct
17 Correct 143 ms 22004 KB Output is correct