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Submission #977673

# Submission time Handle Problem Language Result Execution time Memory
977673 2024-05-08T09:03:57 Z berr Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 83 ms 19864 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=2e5+29;
const int mod = 1e9+7;
 
 
int mul(int x, int y){
    x*=y;
    x-=(x/mod)*mod;
    return x;
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
 
    int t; cin >> t;
    vector<int> p(1e6+38);
    p[0] = 1;
    for(int i=1; i<=1e6; i++){
        p[i] = mul(p[i-1], 29);
    }
 
 
    while(t--){
        string s; cin >> s;
        int n = s.size();
        int sum=0, ans=0;
        vector<int> va(n);

        for(int i=0; i<n; i++){
            sum+=mul((s[i]-'a'+1),p[i+1]);
            if(sum>=mod) sum-=mod;
            va[i]=sum;
        }
 
        int s2=0, l=0, plast=n;
        int siz=0;
        for(int i=n-1; i>=n/2; i--){
            s2=mul(s2, 29);
            s2+=mul((s[i]-'a'+1), 29);
            if(s2>=mod) s2-=mod;
            int val= (l+ mul(s2, p[n-plast]));
            if(val>=mod) val-=mod;

            if(val==va[n-i-1]){
                ans+=2; 
                siz+=(plast-i)*2;
                if(siz>n) ans--, siz-=(plast-i);
                l=val;
                s2=0;
                plast=i;
            }
        }
 
        if(siz!=n) ans++;
        cout<<ans<<"\n";
    }
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8284 KB Output is correct
2 Correct 9 ms 8284 KB Output is correct
3 Correct 9 ms 8280 KB Output is correct
4 Correct 10 ms 8284 KB Output is correct
5 Correct 9 ms 8284 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8284 KB Output is correct
2 Correct 9 ms 8284 KB Output is correct
3 Correct 9 ms 8280 KB Output is correct
4 Correct 10 ms 8284 KB Output is correct
5 Correct 9 ms 8284 KB Output is correct
6 Correct 9 ms 8280 KB Output is correct
7 Correct 9 ms 8284 KB Output is correct
8 Correct 9 ms 8284 KB Output is correct
9 Correct 9 ms 8284 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8284 KB Output is correct
2 Correct 9 ms 8284 KB Output is correct
3 Correct 9 ms 8280 KB Output is correct
4 Correct 10 ms 8284 KB Output is correct
5 Correct 9 ms 8284 KB Output is correct
6 Correct 9 ms 8280 KB Output is correct
7 Correct 9 ms 8284 KB Output is correct
8 Correct 9 ms 8284 KB Output is correct
9 Correct 9 ms 8284 KB Output is correct
10 Correct 10 ms 8280 KB Output is correct
11 Correct 10 ms 8284 KB Output is correct
12 Correct 10 ms 8284 KB Output is correct
13 Correct 9 ms 8536 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8284 KB Output is correct
2 Correct 9 ms 8284 KB Output is correct
3 Correct 9 ms 8280 KB Output is correct
4 Correct 10 ms 8284 KB Output is correct
5 Correct 9 ms 8284 KB Output is correct
6 Correct 9 ms 8280 KB Output is correct
7 Correct 9 ms 8284 KB Output is correct
8 Correct 9 ms 8284 KB Output is correct
9 Correct 9 ms 8284 KB Output is correct
10 Correct 10 ms 8280 KB Output is correct
11 Correct 10 ms 8284 KB Output is correct
12 Correct 10 ms 8284 KB Output is correct
13 Correct 9 ms 8536 KB Output is correct
14 Correct 83 ms 19864 KB Output is correct
15 Correct 52 ms 18784 KB Output is correct
16 Correct 83 ms 18816 KB Output is correct
17 Correct 44 ms 14012 KB Output is correct