oj.uz

Submission #468537

# Submission time Handle Problem Language Result Execution time Memory
468537 2021-08-28T16:42:51 Z idk321 Palindromic Partitions (CEOI17_palindromic) C++17
60 / 100
 10000 ms 59232 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

string s;
const int N = 1000001;
const int MINF = -1000000000;
const int MOD = 1000000007;
const int P = 29;
int res[N];
int vis[N];
ll power[N];

int calc(int n) {
    if (n == s.size() / 2) {
        if (s.size() % 2 == 1) return 1;
        return 0;
    }
    if (res[n]) return res[n];

    ll hash1 = 0;
    ll hash2 = 0;
    int j = 0;
    int cres = 1;
    for (int i = n; i < s.size() / 2; i++, j++) {
        hash2 *= P;
        hash2 %= MOD;
        hash1 += (s[i] - 'a') * power[j];
        hash1 %= MOD;
        hash2 += s[s.size() - 1 - i] - 'a';
        hash2 %= MOD;
        //cout << i << " " << hash1 << " " << hash2 << " " << s.size()<< endl;
        if (hash1 == hash2) {
            cres = max(cres, 2 + calc(i + 1));
        }
    }

    res[n] = cres;
    return res[n];
}


int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    power[0] = 1;
    for (int i = 1; i <N; i++) {
        power[i] = power[i - 1] * P;
        power[i] %= MOD;
    }

    int t;
    cin >> t;
    for (int t1 = 0; t1 < t; t1++) {
        cin >> s;
        int cres = 0;

        for (int i = 0; i < s.size() / 2 + 1; i++) res[i] = 0;
        cout << calc(0) << "\n";
    }
}

/*
4
bonobo
deleted
racecar
racecars
*/

Compilation message

palindromic.cpp: In function 'int calc(int)':
palindromic.cpp:16:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     if (n == s.size() / 2) {
      |         ~~^~~~~~~~~~~~~~~
palindromic.cpp:26:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     for (int i = n; i < s.size() / 2; i++, j++) {
      |                     ~~^~~~~~~~~~~~~~
palindromic.cpp: In function 'int main()':
palindromic.cpp:60:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         for (int i = 0; i < s.size() / 2 + 1; i++) res[i] = 0;
      |                         ~~^~~~~~~~~~~~~~~~~~
palindromic.cpp:58:13: warning: unused variable 'cres' [-Wunused-variable]
   58 |         int cres = 0;
      |             ^~~~

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 8140 KB Output is correct
3 Correct 10 ms 8108 KB Output is correct
4 Correct 9 ms 8148 KB Output is correct
5 Correct 10 ms 8144 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 8140 KB Output is correct
3 Correct 10 ms 8108 KB Output is correct
4 Correct 9 ms 8148 KB Output is correct
5 Correct 10 ms 8144 KB Output is correct
6 Correct 11 ms 8060 KB Output is correct
7 Correct 10 ms 8148 KB Output is correct
8 Correct 10 ms 8140 KB Output is correct
9 Correct 11 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 8140 KB Output is correct
3 Correct 10 ms 8108 KB Output is correct
4 Correct 9 ms 8148 KB Output is correct
5 Correct 10 ms 8144 KB Output is correct
6 Correct 11 ms 8060 KB Output is correct
7 Correct 10 ms 8148 KB Output is correct
8 Correct 10 ms 8140 KB Output is correct
9 Correct 11 ms 8140 KB Output is correct
10 Correct 538 ms 8736 KB Output is correct
11 Correct 103 ms 8396 KB Output is correct
12 Correct 24 ms 8180 KB Output is correct
13 Correct 463 ms 8440 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8140 KB Output is correct
2 Correct 10 ms 8140 KB Output is correct
3 Correct 10 ms 8108 KB Output is correct
4 Correct 9 ms 8148 KB Output is correct
5 Correct 10 ms 8144 KB Output is correct
6 Correct 11 ms 8060 KB Output is correct
7 Correct 10 ms 8148 KB Output is correct
8 Correct 10 ms 8140 KB Output is correct
9 Correct 11 ms 8140 KB Output is correct
10 Correct 538 ms 8736 KB Output is correct
11 Correct 103 ms 8396 KB Output is correct
12 Correct 24 ms 8180 KB Output is correct
13 Correct 463 ms 8440 KB Output is correct
14 Execution timed out 10042 ms 59232 KB Time limit exceeded
15 Halted 0 ms 0 KB -