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Submission #279710

# Submission time Handle Problem Language Result Execution time Memory
279710 2020-08-22T10:03:56 Z BeanZ Palindromic Partitions (CEOI17_palindromic) C++14
100 / 100
 195 ms 28552 KB 
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
const int N = 15;
const int base = 311;
const int mod = 1e9 + 7;
ll h[1000006], p[1000006];
ll get(ll i, ll j){
        return (h[j] - p[j - i + 1] * h[i - 1] + (ll)mod * mod) % mod;
}
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("VietCT.INP", "r")){
                freopen("VietCT.INP", "r", stdin);
                freopen("VietCT.OUT", "w", stdout);
        }
        ll t;
        cin >> t;
        while (t--){
                string s;
                cin >> s;
                ll n = s.length();
                if (n == 1){
                        cout << 1 << endl;
                        continue;
                }
                s = " " + s;
                p[0] = 1;
                for (int i = 1; i <= n; i++){
                        p[i] = p[i - 1] * base % mod;
                }
                for (int i = 1; i <= n; i++){
                        h[i] = (h[i - 1] * base + (s[i] - 'a') + 1) % mod;
                }
                ll lb = 1, rb = 1, le = n, re = n;
                ll ans = 0;
                while (true){
                        if (get(lb, rb) == get(le, re)){
                                lb = rb + 1;
                                re = le - 1;
                                ans += 2;
                                rb++;
                                le--;
                                if (rb > le){
                                        cout << ans << endl;
                                        break;
                                }
                                if (rb == le){
                                        cout << ans + 1 << endl;
                                        break;
                                }
                        } else {
                                rb++;
                                le--;
                                if (rb >= le){
                                        cout << ans + 1 << endl;
                                        break;
                                }
                        }
                }
        }
}
/*
*/

Compilation message

palindromic.cpp: In function 'int main()':
palindromic.cpp:18:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   18 |                 freopen("VietCT.INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:19:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   19 |                 freopen("VietCT.OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 392 KB Output is correct
5 Correct 0 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 392 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 392 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 2 ms 640 KB Output is correct
11 Correct 2 ms 640 KB Output is correct
12 Correct 2 ms 640 KB Output is correct
13 Correct 2 ms 640 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 392 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 2 ms 640 KB Output is correct
11 Correct 2 ms 640 KB Output is correct
12 Correct 2 ms 640 KB Output is correct
13 Correct 2 ms 640 KB Output is correct
14 Correct 195 ms 28552 KB Output is correct
15 Correct 107 ms 23432 KB Output is correct
16 Correct 181 ms 27732 KB Output is correct
17 Correct 109 ms 15136 KB Output is correct