oj.uz

Submission #939316

# Submission time Handle Problem Language Result Execution time Memory
939316 2024-03-06T09:04:32 Z iskhakkutbilim Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 130 ms 27456 KB 
#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
#define int long long
const int mod = 1e9 + 7;
const int p = 31;
const int N = 2e6;
/*
4
bonobo
deleted
racecar
racecars
*/

int pw[N+10];


void solve(){
	string s; cin >> s;
	int n = s.size();
	
	vector<int> hash(n, 0);
	hash[0] = s[0];
	for(int i = 1;i < n; i++){
		hash[i] = (hash[i-1] * p + s[i]) % mod;
	}
	
	auto get=[&](int l, int r){
		if(l == 0) return hash[r];
		int sum = hash[r] - (pw[r-l+1] * hash[l-1]);
		sum = ((sum % mod) + mod) % mod;
		return sum;
	};
	
	
	
	deque<char> dq;
	for(int i = 0;i < n; i++) dq.push_back(s[i]);
	int left = 0, right = n-1;
	int ans = 0;
	while(true){
		int len = -1;
		for(int j = right; j >= 0; j--){
			if(left + right - j >= j) break;
			/*cout << j+1 << " " << right + 1 << '\n';
			cout << left + 1 << ' ' << left + right - j + 1 << "\n";
			cout << get(j, right) << ' ' << get(left, left+(right-j)) << '\n';
			* */
			if(get(j, right) == get(left, left+(right-j))){
				len = (right-j+1);
				break;
			}
		}
		
		if(len == -1){
			ans++;
			break;
		}
		
		ans+= 2;
		if(dq.empty()) break;
		left+= len, right-= len;
		if(right < left) break;

	}
	cout << ans;
}


signed main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	pw[0] = 1;
	for(int i = 1;i <= N; i++){
		pw[i] = (pw[i-1] * p) % mod;
	}
	int tt; cin >> tt;
	while(tt--){
		solve();
		cout << '\n';
	}
	return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15960 KB Output is correct
2 Correct 10 ms 15960 KB Output is correct
3 Correct 10 ms 15964 KB Output is correct
4 Correct 10 ms 16004 KB Output is correct
5 Correct 10 ms 15972 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15960 KB Output is correct
2 Correct 10 ms 15960 KB Output is correct
3 Correct 10 ms 15964 KB Output is correct
4 Correct 10 ms 16004 KB Output is correct
5 Correct 10 ms 15972 KB Output is correct
6 Correct 10 ms 15964 KB Output is correct
7 Correct 10 ms 15964 KB Output is correct
8 Correct 11 ms 16004 KB Output is correct
9 Correct 10 ms 15964 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15960 KB Output is correct
2 Correct 10 ms 15960 KB Output is correct
3 Correct 10 ms 15964 KB Output is correct
4 Correct 10 ms 16004 KB Output is correct
5 Correct 10 ms 15972 KB Output is correct
6 Correct 10 ms 15964 KB Output is correct
7 Correct 10 ms 15964 KB Output is correct
8 Correct 11 ms 16004 KB Output is correct
9 Correct 10 ms 15964 KB Output is correct
10 Correct 12 ms 16220 KB Output is correct
11 Correct 11 ms 15964 KB Output is correct
12 Correct 12 ms 15964 KB Output is correct
13 Correct 11 ms 15996 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15960 KB Output is correct
2 Correct 10 ms 15960 KB Output is correct
3 Correct 10 ms 15964 KB Output is correct
4 Correct 10 ms 16004 KB Output is correct
5 Correct 10 ms 15972 KB Output is correct
6 Correct 10 ms 15964 KB Output is correct
7 Correct 10 ms 15964 KB Output is correct
8 Correct 11 ms 16004 KB Output is correct
9 Correct 10 ms 15964 KB Output is correct
10 Correct 12 ms 16220 KB Output is correct
11 Correct 11 ms 15964 KB Output is correct
12 Correct 12 ms 15964 KB Output is correct
13 Correct 11 ms 15996 KB Output is correct
14 Correct 129 ms 27456 KB Output is correct
15 Correct 78 ms 26648 KB Output is correct
16 Correct 130 ms 26788 KB Output is correct
17 Correct 76 ms 21740 KB Output is correct