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Submission #223992

# Submission time Handle Problem Language Result Execution time Memory
223992 2020-04-17T00:47:13 Z lucas110550 Palindromes (APIO14_palindrome) C++14
100 / 100
 92 ms 65400 KB 
#include <bits/stdc++.h>

using namespace std;

char str[300005];
int n;
int len[300005], ch[300005][26];
int r[300005], f[300005];
char s[101];
int h, t, cnt;
long long sum = 0;
int st, ed;
vector<int> E[300005];

void init() {
	for (int i = 0; i < 2; i ++) memset(ch[i], 0, sizeof(ch[i]));
	len[0] = 0; len[1] = -1;
	f[0] = 1; f[1] = 1;
	st = ed = 0;
	cnt = 1;
	sum = 0;
}

bool valid(int x) {
	return 1 <= x && x <= t;
}

void front_ins(int x) {
	while (str[x + len[st] + 1] != str[x]) st = f[st];
	if (!ch[st][str[x] - 'a']) {
		int j = f[st];
		while (str[x + len[j] + 1] != str[x]) j = f[j];
		len[++ cnt] = len[st] + 2;
		int ff = ch[j][str[x] - 'a'];
		f[cnt] = ff;
		E[ff].push_back(cnt);
		ch[st][str[x] - 'a'] = cnt;
		memset(ch[cnt], 0, sizeof(ch[cnt]));
	}
	st = ch[st][str[x] - 'a'];
	r[st] ++;
//	sum += r[st];
	if (len[st] == t - h) ed = st;
}

void back_ins(int x) {
	while (str[x - len[ed] - 1] != str[x]) ed = f[ed];
	if (!ch[ed][str[x] - 'a']) {
		int j = f[ed];
		while (str[x - len[j] - 1] != str[x]) j = f[j];
		len[++ cnt] = len[ed] + 2;
		int ff = ch[j][str[x] - 'a'];
		f[cnt] = ff;
		E[ff].push_back(cnt);
		ch[ed][str[x] - 'a'] = cnt;
		memset(ch[cnt], 0, sizeof(ch[cnt]));
	}
	ed = ch[ed][str[x] - 'a'];
	r[ed] ++;
//	sum += r[ed];
	if (len[ed] == t - h) st = ed;
}

void dfs(int x) {
	for (int i = 0; i < (int )E[x].size(); i ++) { 
		dfs(E[x][i]);
		r[x] += r[E[x][i]];
	}
}

int main( ) {
	init();
	scanf("%s", str + 1);
	n = (int )strlen(str + 1);
	for (int i = 1; i <= n; i ++) {
		++ t;
		back_ins(i);
	}
	dfs(0);
	for (int i = 2; i <= cnt; i ++) {
		sum = max(sum, 1LL * r[i] * len[i]);
	}
	printf("%lld\n", sum);
	return 0;
}

Compilation message

palindrome.cpp: In function 'int main()':
palindrome.cpp:73:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", str + 1);
  ~~~~~^~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7424 KB Output is correct
2 Correct 10 ms 7424 KB Output is correct
3 Correct 9 ms 7424 KB Output is correct
4 Correct 8 ms 7424 KB Output is correct
5 Correct 9 ms 7424 KB Output is correct
6 Correct 9 ms 7424 KB Output is correct
7 Correct 8 ms 7424 KB Output is correct
8 Correct 9 ms 7424 KB Output is correct
9 Correct 9 ms 7424 KB Output is correct
10 Correct 8 ms 7424 KB Output is correct
11 Correct 8 ms 7424 KB Output is correct
12 Correct 8 ms 7424 KB Output is correct
13 Correct 9 ms 7424 KB Output is correct
14 Correct 8 ms 7424 KB Output is correct
15 Correct 9 ms 7424 KB Output is correct
16 Correct 8 ms 7456 KB Output is correct
17 Correct 10 ms 7424 KB Output is correct
18 Correct 8 ms 7424 KB Output is correct
19 Correct 10 ms 7424 KB Output is correct
20 Correct 8 ms 7424 KB Output is correct
21 Correct 8 ms 7424 KB Output is correct
22 Correct 8 ms 7424 KB Output is correct
23 Correct 8 ms 7424 KB Output is correct
24 Correct 8 ms 7424 KB Output is correct
25 Correct 10 ms 7424 KB Output is correct
26 Correct 8 ms 7424 KB Output is correct
27 Correct 8 ms 7424 KB Output is correct
28 Correct 10 ms 7424 KB Output is correct
29 Correct 8 ms 7424 KB Output is correct
30 Correct 9 ms 7424 KB Output is correct
31 Correct 8 ms 7424 KB Output is correct
32 Correct 9 ms 7424 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7680 KB Output is correct
2 Correct 9 ms 7552 KB Output is correct
3 Correct 8 ms 7552 KB Output is correct
4 Correct 9 ms 7552 KB Output is correct
5 Correct 8 ms 7552 KB Output is correct
6 Correct 9 ms 7552 KB Output is correct
7 Correct 9 ms 7552 KB Output is correct
8 Correct 8 ms 7552 KB Output is correct
9 Correct 10 ms 7552 KB Output is correct
10 Correct 9 ms 7424 KB Output is correct
11 Correct 8 ms 7424 KB Output is correct
12 Correct 10 ms 7552 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 9088 KB Output is correct
2 Correct 10 ms 9088 KB Output is correct
3 Correct 10 ms 9344 KB Output is correct
4 Correct 12 ms 9216 KB Output is correct
5 Correct 9 ms 8704 KB Output is correct
6 Correct 12 ms 8832 KB Output is correct
7 Correct 10 ms 8960 KB Output is correct
8 Correct 8 ms 7424 KB Output is correct
9 Correct 9 ms 7424 KB Output is correct
10 Correct 9 ms 8320 KB Output is correct

Subtask #4
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 24448 KB Output is correct
2 Correct 23 ms 23424 KB Output is correct
3 Correct 29 ms 26744 KB Output is correct
4 Correct 24 ms 25088 KB Output is correct
5 Correct 26 ms 20096 KB Output is correct
6 Correct 23 ms 17792 KB Output is correct
7 Correct 20 ms 20224 KB Output is correct
8 Correct 11 ms 7680 KB Output is correct
9 Correct 18 ms 12004 KB Output is correct
10 Correct 22 ms 18304 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 58488 KB Output is correct
2 Correct 59 ms 53408 KB Output is correct
3 Correct 61 ms 65400 KB Output is correct
4 Correct 52 ms 56576 KB Output is correct
5 Correct 92 ms 46456 KB Output is correct
6 Correct 48 ms 48376 KB Output is correct
7 Correct 48 ms 44792 KB Output is correct
8 Correct 15 ms 8192 KB Output is correct
9 Correct 15 ms 8192 KB Output is correct
10 Correct 63 ms 39416 KB Output is correct
11 Correct 61 ms 53752 KB Output is correct
12 Correct 20 ms 13312 KB Output is correct