oj.uz

Submission #104297

# Submission time Handle Problem Language Result Execution time Memory
104297 2019-04-05T01:53:32 Z dupreez Palindromes (APIO14_palindrome) C++14
23 / 100
 284 ms 21924 KB 
#include <iostream>
#include <algorithm>
#include <cstring>
#include <sstream>
#include <map>
#include <queue>
#include <vector>
#include <stack>
#include <unordered_map>
#define mk make_pair
#define pb push_back
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;
typedef pair<ll, ll> pos;
const ll MOD = 1000000007,N=1010;
const ull b = MOD;
string s,s2;
unsigned long long int hs[N],bs[N];
ll ans = 0;
unordered_map<ull, int> mp[N];

ull hsh(int i1, int i2) {
	ull v1 = hs[i1] - hs[i2 + 1];
	v1 *= bs[i1];
	return v1;
}

int main() {
	cin >> s;
	bs[0] = 1;
	for (int i = 1; i < N; i++)bs[i] = bs[i - 1] * b;
	for (int i = s.size() - 1; i >= 0; i--) {
		hs[i] = hs[i + 1] +((ull)s[i] - 'a') * bs[s.size() - 1 - i];
	}
	for (int i1 = 0; i1 < s.size(); i1++) {
		for (int i2 = i1; i2 < s.size(); i2++) {
			mp[i2 - i1 + 1][hsh(i1,i2)]++;
		}
	}

	for (int i1 = 0; i1 < s.size(); i1++) {
		for (int i2 = 0; i1 + i2 < s.size() && i1 - i2 >= 0; i2++) {
			if (s[i1 + i2] != s[i1 - i2])break;
			ll v1 = i2 * 2 + 1, v2 = mp[v1][hsh(i1 - i2, i1 + i2)];
			ans = max(ans, v1 * v2);
		}
		for (int i2 = 0; i1 +1+i2 < s.size() && i1 - i2 >= 0; i2++) {
			if (s[i1 + i2 + 1] != s[i1 - i2])break;
			ll v1 = i2 * 2 + 2, v2 = mp[v1][hsh(i1 - i2, i1 + i2 + 1)];
			ans = max(ans, v1 * v2);
		}
	}
	cout << ans << endl;
	return 0;
}

Compilation message

palindrome.cpp: In function 'int main()':
palindrome.cpp:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i1 = 0; i1 < s.size(); i1++) {
                   ~~~^~~~~~~~~~
palindrome.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i2 = i1; i2 < s.size(); i2++) {
                     ~~~^~~~~~~~~~
palindrome.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i1 = 0; i1 < s.size(); i1++) {
                   ~~~^~~~~~~~~~
palindrome.cpp:43:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i2 = 0; i1 + i2 < s.size() && i1 - i2 >= 0; i2++) {
                    ~~~~~~~~^~~~~~~~~~
palindrome.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i2 = 0; i1 +1+i2 < s.size() && i1 - i2 >= 0; i2++) {
                    ~~~~~~~~~^~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 3 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 3 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 3 ms 384 KB Output is correct
18 Correct 3 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 3 ms 384 KB Output is correct
21 Correct 4 ms 512 KB Output is correct
22 Correct 3 ms 640 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 2 ms 512 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 4 ms 512 KB Output is correct
27 Correct 3 ms 512 KB Output is correct
28 Correct 3 ms 512 KB Output is correct
29 Correct 3 ms 512 KB Output is correct
30 Correct 4 ms 640 KB Output is correct
31 Correct 3 ms 512 KB Output is correct
32 Correct 3 ms 512 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 512 KB Output is correct
2 Correct 138 ms 12092 KB Output is correct
3 Correct 20 ms 384 KB Output is correct
4 Correct 243 ms 19704 KB Output is correct
5 Correct 18 ms 512 KB Output is correct
6 Correct 17 ms 384 KB Output is correct
7 Correct 195 ms 14812 KB Output is correct
8 Correct 17 ms 512 KB Output is correct
9 Correct 283 ms 20472 KB Output is correct
10 Correct 284 ms 21924 KB Output is correct
11 Correct 275 ms 21904 KB Output is correct
12 Correct 214 ms 16832 KB Output is correct

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Runtime error 4 ms 640 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 26.0

# Verdict Execution time Memory Grader output
1 Runtime error 7 ms 1024 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 13 ms 1692 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -