oj.uz

Submission #989096

# Submission time Handle Problem Language Result Execution time Memory
989096 2024-05-27T14:10:59 Z mnbvcxz123 Palindromes (APIO14_palindrome) C++17
100 / 100
 45 ms 74200 KB 
#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;

struct Node {
	int nxt[26], sufflink;
	ll len, cnt;
	vector<int> edges;
} tree[303030];

string s;
int suff, num;
ll ans = 0;

void add_letter(int pos) {
	int curr = suff, curr_len = 0;
	int letter = s[pos] - 'a';

	while (true) {
		curr_len = tree[curr].len;
		if (pos - 1 - curr_len > -1 && s[pos - 1 - curr_len] == s[pos]) break;
		curr = tree[curr].sufflink;
	}
	if (tree[curr].nxt[letter]) {
		suff = tree[curr].nxt[letter];
		tree[suff].cnt++;
		return;
	}

	suff = ++num;
	tree[num].len = tree[curr].len + 2;
	tree[num].cnt = 1;
	tree[curr].nxt[letter] = num;

	if (tree[num].len == 1) {
		tree[num].sufflink = 2;
		tree[2].edges.push_back(num);
		return;
	}

	while (true) {
		curr = tree[curr].sufflink;
		curr_len = tree[curr].len;
		if (pos - 1 - curr_len > -1 && s[pos - 1 - curr_len] == s[pos]) {
			tree[num].sufflink = tree[curr].nxt[letter];
			tree[tree[curr].nxt[letter]].edges.push_back(num);
			break;
		}
	}
}

void init() {
	num = 2, suff = 2;
	tree[1].len = -1, tree[1].sufflink = 1;
	tree[2].len = 0, tree[2].sufflink = 1;
	tree[1].edges.push_back(2);
}

void dfs(int node = 1) {
	for (int i : tree[node].edges) {
		dfs(i);
		tree[node].cnt += tree[i].cnt;
	}
	ans = max(ans, tree[node].len * tree[node].cnt);
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> s;
	init();
	FOR(i, 0, s.size()) add_letter(i);
	dfs();
	cout << ans;
	return 0;
}

Compilation message

palindrome.cpp: In function 'int main()':
palindrome.cpp:2:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    2 | #define FOR(i, x, y) for (int i = x; i < y; i++)
......
   73 |  FOR(i, 0, s.size()) add_letter(i);
      |      ~~~~~~~~~~~~~~                     
palindrome.cpp:73:2: note: in expansion of macro 'FOR'
   73 |  FOR(i, 0, s.size()) add_letter(i);
      |  ^~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 45404 KB Output is correct
2 Correct 6 ms 45404 KB Output is correct
3 Correct 7 ms 45404 KB Output is correct
4 Correct 7 ms 45656 KB Output is correct
5 Correct 7 ms 45404 KB Output is correct
6 Correct 7 ms 45404 KB Output is correct
7 Correct 7 ms 45404 KB Output is correct
8 Correct 9 ms 45404 KB Output is correct
9 Correct 7 ms 45404 KB Output is correct
10 Correct 9 ms 45404 KB Output is correct
11 Correct 7 ms 45404 KB Output is correct
12 Correct 7 ms 45520 KB Output is correct
13 Correct 8 ms 45404 KB Output is correct
14 Correct 7 ms 45404 KB Output is correct
15 Correct 6 ms 45404 KB Output is correct
16 Correct 8 ms 45404 KB Output is correct
17 Correct 7 ms 45520 KB Output is correct
18 Correct 6 ms 45404 KB Output is correct
19 Correct 7 ms 45528 KB Output is correct
20 Correct 7 ms 45404 KB Output is correct
21 Correct 7 ms 45404 KB Output is correct
22 Correct 6 ms 45400 KB Output is correct
23 Correct 7 ms 45404 KB Output is correct
24 Correct 7 ms 45656 KB Output is correct
25 Correct 7 ms 45428 KB Output is correct
26 Correct 8 ms 45404 KB Output is correct
27 Correct 7 ms 45404 KB Output is correct
28 Correct 7 ms 45404 KB Output is correct
29 Correct 7 ms 45404 KB Output is correct
30 Correct 7 ms 45404 KB Output is correct
31 Correct 7 ms 45400 KB Output is correct
32 Correct 7 ms 45404 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 45400 KB Output is correct
2 Correct 7 ms 45400 KB Output is correct
3 Correct 8 ms 45400 KB Output is correct
4 Correct 8 ms 45404 KB Output is correct
5 Correct 7 ms 45608 KB Output is correct
6 Correct 7 ms 45400 KB Output is correct
7 Correct 7 ms 45404 KB Output is correct
8 Correct 7 ms 45404 KB Output is correct
9 Correct 7 ms 45404 KB Output is correct
10 Correct 7 ms 45404 KB Output is correct
11 Correct 7 ms 45408 KB Output is correct
12 Correct 7 ms 45404 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 46172 KB Output is correct
2 Correct 8 ms 45916 KB Output is correct
3 Correct 9 ms 46428 KB Output is correct
4 Correct 8 ms 46296 KB Output is correct
5 Correct 8 ms 45660 KB Output is correct
6 Correct 7 ms 45784 KB Output is correct
7 Correct 8 ms 45916 KB Output is correct
8 Correct 8 ms 45404 KB Output is correct
9 Correct 8 ms 45404 KB Output is correct
10 Correct 8 ms 45404 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 51800 KB Output is correct
2 Correct 15 ms 50524 KB Output is correct
3 Correct 17 ms 54876 KB Output is correct
4 Correct 16 ms 52828 KB Output is correct
5 Correct 13 ms 46816 KB Output is correct
6 Correct 12 ms 47704 KB Output is correct
7 Correct 14 ms 48984 KB Output is correct
8 Correct 9 ms 45660 KB Output is correct
9 Correct 11 ms 47708 KB Output is correct
10 Correct 12 ms 46672 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 64740 KB Output is correct
2 Correct 30 ms 58072 KB Output is correct
3 Correct 45 ms 74200 KB Output is correct
4 Correct 33 ms 62180 KB Output is correct
5 Correct 36 ms 50404 KB Output is correct
6 Correct 32 ms 57304 KB Output is correct
7 Correct 29 ms 55000 KB Output is correct
8 Correct 12 ms 46308 KB Output is correct
9 Correct 12 ms 46308 KB Output is correct
10 Correct 27 ms 49636 KB Output is correct
11 Correct 31 ms 58392 KB Output is correct
12 Correct 15 ms 48612 KB Output is correct