oj.uz

Submission #48020

# Submission time Handle Problem Language Result Execution time Memory
48020 2018-05-09T11:58:01 Z E869120 Palindromes (APIO14_palindrome) C++14
47 / 100
 1000 ms 19204 KB 
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
using namespace std;

string S; int L[100009], N, col[100009], cnts; vector<int>x[100009], y[100009];

long long Get(int pos) {
	if (pos < 0) return -1;
	if (pos >= N) return -2;
	return L[pos];
}

long long roll1[1009][1009], roll2[1009][1009];

void solve_naive() {
	map<long long, long long>M;

	for (int i = 0; i < S.size(); i++) {
		for (int j = i; j < S.size(); j++) {
			if (j != 0) roll1[i][j] = roll1[i][j - 1] * 331LL;
			roll1[i][j] += (S[j] - 'a' + 1);
		}
	}
	for (int i = 0; i < S.size(); i++) {
		for (int j = i; j >= 0; j--) {
			roll2[i][j] = roll2[i][j + 1] * 331LL;
			roll2[i][j] += (S[j] - 'a' + 1);
		}
	}
	long long maxn = 0;
	for (int i = 0; i < S.size(); i++) {
		for (int j = i; j < S.size(); j++) {
			if (roll1[i][j] != roll2[j][i]) continue;
			M[roll1[i][j]] += (j - i + 1);
			maxn = max(maxn, M[roll1[i][j]]);
		}
	}
	cout << maxn << endl;
}

int main() {
	cin >> S; N = S.size();
	if (S.size() == 1) { cout << "1" << endl; return 0; }
	if (S.size() <= 1000) { solve_naive(); return 0; }
	for (int i = 0; i < N; i++) L[i] = (S[i] - 'a');
	for (int i = 0; i < N; i++) x[0].push_back(i);

	long long maxn = 0; cnts = 1;

	for (int i = 0; i <= N / 2 + 1; i++) {
		int cnt = 0;
		for (int j = 0; j < cnts; j++) {
			if (x[j].size() == 1) { int to = x[j][0]; if (Get(to - i) == Get(to + i)) { y[cnt] = x[j]; cnt++; } continue; }

			vector<int>H[26];
			for (int k = 0; k < x[j].size(); k++) {
				int to = x[j][k];
				if (Get(to - i) != Get(to + i)) continue;
				H[Get(to + i)].emplace_back(to);
			}
			for (int k = 0; k < 26; k++) {
				if (H[k].size() >= 1) { y[cnt] = H[k]; cnt++; }
			}
		}
		for (int j = 0; j < cnt; j++) { x[j] = y[j]; maxn = max(maxn, 1LL * (long long)x[j].size()*(i * 2 + 1)); } cnts = cnt;
	}

	for (int i = 0; i < 100009; i++) x[i].clear(); cnts = 1;
	for (int i = 0; i < N; i++) x[0].push_back(i);

	for (int i = 0; i <= N / 2 + 1; i++) {
		int cnt = 0;
		for (int j = 0; j < cnts; j++) {
			if (x[j].size() == 1) { int to = x[j][0]; if (Get(to - i) == Get(to + i)) { y[cnt] = x[j]; cnt++; } continue; }

			vector<int>H[26];
			for (int k = 0; k < x[j].size(); k++) {
				int to = x[j][k];
				if (Get(to - i) != Get(to + i + 1)) continue;
				H[Get(to + i)].emplace_back(to);
			}
			for (int k = 0; k < 26; k++) {
				if (H[k].size() >= 1) { y[cnt] = H[k]; cnt++; }
			}
		}
		for (int j = 0; j < cnt; j++) { x[j] = y[j]; maxn = max(maxn, 1LL * (long long)x[j].size()*(i * 2 + 2)); }
		cnts = cnt;
	}
	cout << maxn << endl;
	return 0;
}

Compilation message

palindrome.cpp: In function 'void solve_naive()':
palindrome.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < S.size(); i++) {
                  ~~^~~~~~~~~~
palindrome.cpp:22:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j = i; j < S.size(); j++) {
                   ~~^~~~~~~~~~
palindrome.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < S.size(); i++) {
                  ~~^~~~~~~~~~
palindrome.cpp:34:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < S.size(); i++) {
                  ~~^~~~~~~~~~
palindrome.cpp:35:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j = i; j < S.size(); j++) {
                   ~~^~~~~~~~~~
palindrome.cpp: In function 'int main()':
palindrome.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int k = 0; k < x[j].size(); k++) {
                    ~~^~~~~~~~~~~~~
palindrome.cpp:71:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (int i = 0; i < 100009; i++) x[i].clear(); cnts = 1;
  ^~~
palindrome.cpp:71:49: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  for (int i = 0; i < 100009; i++) x[i].clear(); cnts = 1;
                                                 ^~~~
palindrome.cpp:80:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int k = 0; k < x[j].size(); k++) {
                    ~~^~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Correct 5 ms 5220 KB Output is correct
3 Correct 6 ms 5220 KB Output is correct
4 Correct 7 ms 5220 KB Output is correct
5 Correct 5 ms 5220 KB Output is correct
6 Correct 5 ms 5220 KB Output is correct
7 Correct 6 ms 5220 KB Output is correct
8 Correct 5 ms 5220 KB Output is correct
9 Correct 6 ms 5248 KB Output is correct
10 Correct 6 ms 5384 KB Output is correct
11 Correct 6 ms 5560 KB Output is correct
12 Correct 5 ms 5560 KB Output is correct
13 Correct 6 ms 5560 KB Output is correct
14 Correct 6 ms 5584 KB Output is correct
15 Correct 6 ms 5584 KB Output is correct
16 Correct 6 ms 5584 KB Output is correct
17 Correct 6 ms 5584 KB Output is correct
18 Correct 5 ms 5584 KB Output is correct
19 Correct 6 ms 6092 KB Output is correct
20 Correct 7 ms 6100 KB Output is correct
21 Correct 7 ms 6228 KB Output is correct
22 Correct 6 ms 6228 KB Output is correct
23 Correct 7 ms 6228 KB Output is correct
24 Correct 6 ms 6228 KB Output is correct
25 Correct 7 ms 6228 KB Output is correct
26 Correct 6 ms 6228 KB Output is correct
27 Correct 6 ms 6228 KB Output is correct
28 Correct 6 ms 6228 KB Output is correct
29 Correct 6 ms 6228 KB Output is correct
30 Correct 6 ms 6240 KB Output is correct
31 Correct 6 ms 6240 KB Output is correct
32 Correct 6 ms 6240 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 56 ms 19044 KB Output is correct
2 Correct 36 ms 19044 KB Output is correct
3 Correct 87 ms 19204 KB Output is correct
4 Correct 27 ms 19204 KB Output is correct
5 Correct 90 ms 19204 KB Output is correct
6 Correct 86 ms 19204 KB Output is correct
7 Correct 25 ms 19204 KB Output is correct
8 Correct 57 ms 19204 KB Output is correct
9 Correct 26 ms 19204 KB Output is correct
10 Correct 24 ms 19204 KB Output is correct
11 Correct 24 ms 19204 KB Output is correct
12 Correct 25 ms 19204 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 192 ms 19204 KB Output is correct
2 Correct 114 ms 19204 KB Output is correct
3 Correct 370 ms 19204 KB Output is correct
4 Correct 275 ms 19204 KB Output is correct
5 Correct 8 ms 19204 KB Output is correct
6 Correct 18 ms 19204 KB Output is correct
7 Correct 52 ms 19204 KB Output is correct
8 Correct 6 ms 19204 KB Output is correct
9 Correct 6 ms 19204 KB Output is correct
10 Correct 7 ms 19204 KB Output is correct

Subtask #4
0 / 26.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1082 ms 19204 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 22 ms 19204 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -