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Submission #46477

# Submission time Handle Problem Language Result Execution time Memory
46477 2018-04-21T02:55:22 Z RockyB Palindromic Partitions (CEOI17_palindromic) C++17
60 / 100
 10000 ms 26180 KB 
/// In The Name Of God

#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include <bits/stdc++.h>

#define f first
#define s second

#define pb push_back
#define pp pop_back
#define mp make_pair

#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()

#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);

#define nl '\n'
#define ioi exit(0);

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

const int N = (int)1e6 + 7;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;

const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};

using namespace std;

int n;
char s[N];
int dp[N];



const int p1 = 997;

struct hs {
	ull h[N], dg[N];
	void init() {
		dg[0] = 1;
		for (int i = 0; i <= n; i++) {
			dg[i + 1] = dg[i] * p1;
			if (i) h[i + 1] = h[i] * p1 + s[i];
		}
	}
	ull get(int l, int r) {
		return h[r + 1] - h[l] * dg[r - l + 1];
	}
} t;

bool check(int l1, int l2, int len) {
	return t.get(l1, l1 + len - 1) == t.get(l2, l2 + len - 1);
	for (int i = 0; i < len; i++) {
		if (s[i + l1] != s[i + l2]) return 0;
	}
	return 1;
}
void solve() {
	cin >> (s + 1);
	n = strlen(s + 1);
	memset(dp, -0x3f, sizeof(dp));
	dp[0] = 0;
	t.init();
	int go = (n + 1) >> 1;
	for (int i = 1; i <= go; i++) {
		int total = 0;
		for (int j = i; j >= 1 && total <= 500; j--) {
			if (check(j, n - i + 1, i - j + 1)) {
				++total;
				dp[i] = max(dp[i], dp[j - 1] + 1 + (j != n - i + 1));
			}
		}
	}
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		if (i <= n / 2) ans = max(ans, dp[i]);
		int l = i, r = n - i + 1;
		if (l <= r) {
			ans = max(ans, dp[l - 1] + 1);
		}
	}
	cout << ans << nl;
}
int main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
	#endif
	Kazakhstan
	int t = 1;
	cin >> t;
	while (t--) {
		solve();
	}
	ioi
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4216 KB Output is correct
2 Correct 7 ms 4332 KB Output is correct
3 Correct 5 ms 4488 KB Output is correct
4 Correct 6 ms 4516 KB Output is correct
5 Correct 7 ms 4516 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4216 KB Output is correct
2 Correct 7 ms 4332 KB Output is correct
3 Correct 5 ms 4488 KB Output is correct
4 Correct 6 ms 4516 KB Output is correct
5 Correct 7 ms 4516 KB Output is correct
6 Correct 7 ms 4516 KB Output is correct
7 Correct 6 ms 4516 KB Output is correct
8 Correct 7 ms 4516 KB Output is correct
9 Correct 7 ms 4516 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4216 KB Output is correct
2 Correct 7 ms 4332 KB Output is correct
3 Correct 5 ms 4488 KB Output is correct
4 Correct 6 ms 4516 KB Output is correct
5 Correct 7 ms 4516 KB Output is correct
6 Correct 7 ms 4516 KB Output is correct
7 Correct 6 ms 4516 KB Output is correct
8 Correct 7 ms 4516 KB Output is correct
9 Correct 7 ms 4516 KB Output is correct
10 Correct 176 ms 4760 KB Output is correct
11 Correct 152 ms 4760 KB Output is correct
12 Correct 468 ms 4760 KB Output is correct
13 Correct 241 ms 4760 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4216 KB Output is correct
2 Correct 7 ms 4332 KB Output is correct
3 Correct 5 ms 4488 KB Output is correct
4 Correct 6 ms 4516 KB Output is correct
5 Correct 7 ms 4516 KB Output is correct
6 Correct 7 ms 4516 KB Output is correct
7 Correct 6 ms 4516 KB Output is correct
8 Correct 7 ms 4516 KB Output is correct
9 Correct 7 ms 4516 KB Output is correct
10 Correct 176 ms 4760 KB Output is correct
11 Correct 152 ms 4760 KB Output is correct
12 Correct 468 ms 4760 KB Output is correct
13 Correct 241 ms 4760 KB Output is correct
14 Execution timed out 10019 ms 26180 KB Time limit exceeded
15 Halted 0 ms 0 KB -