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Submission #916493

# Submission time Handle Problem Language Result Execution time Memory
916493 2024-01-26T02:19:53 Z penguin133 Palindromic Partitions (CEOI17_palindromic) C++17
15 / 100
 1 ms 1116 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

string s;
const int mod = 1e18 - 1, mod2 = 1e17 + 5;
int memo[305][305];

int slv(int l, int r){
	if(l > r)return 0;
	if(l == r)return 1;
	if(memo[l][r] != -1)return memo[l][r];
	int cur = 1, cur2 = 1, cnt = 0, cnt2 = 0, cnt3 = 0, cnt4 = 0;
	int ans = 1;
	for(int i = l, j = r; i <= j; i++, j--){
		cnt = cnt * 26 + (s[i] - 'a');
		cnt3 = cnt3 * 26 + (s[i] - 'a');
		cnt2 += cur * (s[j] - 'a');
		cnt4 += cur2 * (s[j] - 'a');
		cur *= 26; cur %= mod; cur2 *= 26; cur2 %= mod2;
		cnt %= mod; cnt2 %= mod; cnt3 %= mod2; cnt4 %= mod2;
		if(cnt == cnt2 && cnt3 == cnt4)ans = max(ans, slv(i + 1, j - 1) + 2);
	}
	return memo[l][r] = ans;
}

void solve(){
	cin >> s;
	memset(memo, -1, sizeof(memo));
	cout << slv(0, (int)s.length() - 1) << '\n';
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message

palindromic.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   42 | main(){
      | ^~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 1 ms 1116 KB Output is correct
4 Correct 1 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 1 ms 1116 KB Output is correct
4 Correct 1 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Incorrect 1 ms 1116 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 1 ms 1116 KB Output is correct
4 Correct 1 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Incorrect 1 ms 1116 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 1 ms 1116 KB Output is correct
4 Correct 1 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Incorrect 1 ms 1116 KB Output isn't correct
7 Halted 0 ms 0 KB -