Submission #1087888

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087888		shidou26	Palindromic Partitions (CEOI17_palindromic)	C++14	100 / 100	202 ms	29028 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 hsh[N], pwr[N];

void prepare() {    
    pwr[0] = 1;
    for(int i = 1; i < N; i++) pwr[i] = prod(pwr[i - 1], base);
}

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

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

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

    int last_i = 1, i = 1, last_j = n, j = n, chunks = 0, cnt = 0;
    while(i <= j) {
        while(query(last_i, i) != query(j, last_j)) {
            i++;
            j--;
        }
        // cout << last_i << " " << i << " " << j << " " << last_j << endl;
        chunks = chunks + (last_i == j && i == last_j ? 1 : 2);
        i++; last_i = i;
        j--; last_j = j;
    }
    cout << chunks << endl;
}

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

    #define task "Date_A_Live"
    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 'void process()':
palindromic.cpp:39:59: warning: unused variable 'cnt' [-Wunused-variable]
   39 |     int last_i = 1, i = 1, last_j = n, j = n, chunks = 0, cnt = 0;
      |                                                           ^~~
palindromic.cpp: In function 'int main()':
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".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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