Submission #1083612

# Submission time Handle Problem Language Result Execution time Memory
1083612 2024-09-03T15:09:59 Z shidou26 Palindromic Partitions (CEOI17_palindromic) C++14
100 / 100
498 ms 89140 KB
#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())

typedef long long ll;
typedef pair<int, int> ii;

const int MOD = 1e9 + 7;
inline ll add(ll x, ll y, ll mod = MOD) {return ((x % mod) + (y % mod)) % mod;}
inline ll sub(ll x, ll y, ll mod = MOD) {return ((x - y) % mod + mod) % mod;}
inline ll prod(ll x, ll y, ll mod = MOD) {return ((x % mod) * (y % mod)) % mod;}

const int N = 1e6 + 3;
const int base = 31;

int n;
string s;

ll pwr[N], hsh[N];

ll get(int l, int r) {return sub(hsh[r], prod(hsh[l - 1], pwr[r - l + 1]));}

void prepare() {

}	

void input() {
	cin >> s; n = s.size(); s = '.' + s;
}

void process() {
	pwr[0] = 1;
	for(int i = 1; i <= n; i++) pwr[i] = prod(pwr[i - 1], base);
	for(int i = 1; i <= n; i++) hsh[i] = add(prod(hsh[i - 1], base), s[i] - 'a' + 1);

	vector<string> total;
	for(int i = 1, j = 1; j <= n; j++) {
		if(get(i, j) == get(n - j + 1, n - i + 1)) {
			string current;
			for(int k = i; k <= j; k++) current.push_back(s[k]);
			total.push_back(current);
			i = j + 1;
		}
	}
	cout << (int)total.size() << endl;
	// for(string p : total) cout << p << endl;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #define task "PALTEXT"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    
    prepare();
    
    int tc = 1; cin >> tc;
    
    for(int i = 1; i <= tc; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deito hajimemashou" << endl;

    return 0;
}

/*
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*/

Compilation message

palindromic.cpp: In function 'int main()':
palindromic.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 392 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 392 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 5 ms 1452 KB Output is correct
11 Correct 3 ms 860 KB Output is correct
12 Correct 4 ms 604 KB Output is correct
13 Correct 5 ms 868 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 392 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 5 ms 1452 KB Output is correct
11 Correct 3 ms 860 KB Output is correct
12 Correct 4 ms 604 KB Output is correct
13 Correct 5 ms 868 KB Output is correct
14 Correct 498 ms 89140 KB Output is correct
15 Correct 255 ms 57092 KB Output is correct
16 Correct 385 ms 28776 KB Output is correct
17 Correct 278 ms 30608 KB Output is correct