Submission #1083612

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083612		shidou26	Palindromic Partitions (CEOI17_palindromic)	C++14	100 / 100	498 ms	89140 KiB

palindromic

#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 (stderr)

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);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40