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Submission #239765

# Submission time Handle Problem Language Result Execution time Memory
239765 2020-06-17T09:15:25 Z neihcr7j Palindromes (APIO14_palindrome) C++14
47 / 100
 1000 ms 7808 KB 
#include<bits/stdc++.h>

#define M 1000000013
#define maxn 300005

using namespace std;
typedef long long ll;

ll mul(ll a, ll b) {
  return a * b % M;
}

ll norm(ll a) {
  return (a < 0 ? a + M : a >= M ? a - M : a);
}

char a[maxn];
ll h[maxn], ih[maxn];
ll p[maxn];

int get(ll h[], int l, int r) {
  return norm(h[r] - mul(h[l - 1], p[r - l + 1]));
}

int main(){
  #define TASK "ABC"
  //freopen(TASK".inp", "r", stdin); freopen(TASK".out", "w", stdout);
  ios_base::sync_with_stdio(0);

  cin >> a + 1;
  int n = strlen(a + 1);

  p[0] = 1;
  for (int i = 1; i <= n; ++i)
    p[i] = mul(p[i - 1], 26);

  h[0] = 0;
  for (int i = 1; i <= n; ++i)
    h[i] = norm(mul(h[i - 1], 26) + a[i]);

  ih[0] = 0;
  for (int i = 1; i <= n; ++i)
    ih[i] = norm(mul(ih[i - 1], 26) + a[n - i + 1]);

  ll ans = 0;
  for (int len = 0; len < n; ++len) {
    map < ll, ll > mp;
    for (int i = 1; i + len <= n; ++i) {
      ll ret = get(h, i, i + len);
      if (ret != get(ih, n + 1 - i - len, n + 1 - i)) continue;
      ans = max(ans, (++mp[ret]) * (len + 1));
    }
  }

  cout << ans << '\n';
  return 0;
}

Compilation message

palindrome.cpp: In function 'int main()':
palindrome.cpp:30:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   cin >> a + 1;
          ~~^~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 4 ms 384 KB Output is correct
25 Correct 5 ms 384 KB Output is correct
26 Correct 5 ms 384 KB Output is correct
27 Correct 5 ms 384 KB Output is correct
28 Correct 5 ms 384 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 384 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 384 KB Output is correct
2 Correct 13 ms 384 KB Output is correct
3 Correct 12 ms 384 KB Output is correct
4 Correct 13 ms 384 KB Output is correct
5 Correct 12 ms 384 KB Output is correct
6 Correct 12 ms 384 KB Output is correct
7 Correct 14 ms 384 KB Output is correct
8 Correct 12 ms 384 KB Output is correct
9 Correct 14 ms 384 KB Output is correct
10 Correct 13 ms 384 KB Output is correct
11 Correct 13 ms 384 KB Output is correct
12 Correct 13 ms 384 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 694 ms 640 KB Output is correct
2 Correct 791 ms 640 KB Output is correct
3 Correct 748 ms 664 KB Output is correct
4 Correct 802 ms 760 KB Output is correct
5 Correct 908 ms 760 KB Output is correct
6 Correct 893 ms 640 KB Output is correct
7 Correct 874 ms 760 KB Output is correct
8 Correct 894 ms 640 KB Output is correct
9 Correct 884 ms 760 KB Output is correct
10 Correct 895 ms 760 KB Output is correct

Subtask #4
0 / 26.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1094 ms 2944 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1088 ms 7808 KB Time limit exceeded
2 Halted 0 ms 0 KB -