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Submission #625403

# Submission time Handle Problem Language Result Execution time Memory
625403 2022-08-10T11:15:37 Z Alma Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 189 ms 27904 KB 
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
using ll = long long;
using ii = pair<int,int>;

const int INF = 1e9;
const ll LLINF = 1e18;
using vi = vector<int>;
using vvi = vector<vi>;

void setIO (string fileName) {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    if (fileName != "std") {
        freopen((fileName + ".in").c_str(), "r", stdin);
        freopen((fileName + ".out").c_str(), "w", stdout);
    }
}

int main() {
    setIO("std");

    int tc;
	cin >> tc;

	while (tc--) {
		string s;
		cin >> s;
		int n = s.size();

		ll B = 239, M = 1e9+7;
		vector<ll> p(n+1), hs(n+1);
		p[0] = 1; hs[0] = 0;
		
		for (int i = 0; i < n; i++) {
			p[i+1] = (p[i] * B) % M;
			hs[i+1] = (hs[i] * B + s[i]) % M;
		}

		int l = 0, r = n, ans = 0;
		while (l < r) {
			int k = 0;
			ll hs1 = 0, hs2 = 1;
			while (hs1 != hs2) {
				k++;
				hs1 = hs[l+k] - (hs[l] * p[k]) % M;
				hs2 = hs[r] - (hs[r-k] * p[k]) % M;
				if (hs1 < 0) hs1 += M;
				if (hs2 < 0) hs2 += M;
			}
			if (r-l == k) ans++;
			else ans += 2;
			l += k;
			r -= k;
		}

		cout << ans << '\n';
	}

    return 0;
}

Compilation message

palindromic.cpp: In function 'void setIO(std::string)':
palindromic.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen((fileName + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen((fileName + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 2 ms 596 KB Output is correct
11 Correct 1 ms 540 KB Output is correct
12 Correct 2 ms 560 KB Output is correct
13 Correct 2 ms 548 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 2 ms 596 KB Output is correct
11 Correct 1 ms 540 KB Output is correct
12 Correct 2 ms 560 KB Output is correct
13 Correct 2 ms 548 KB Output is correct
14 Correct 189 ms 27904 KB Output is correct
15 Correct 104 ms 22656 KB Output is correct
16 Correct 174 ms 26216 KB Output is correct
17 Correct 92 ms 15100 KB Output is correct