oj.uz

Submission #645088

# Submission time Handle Problem Language Result Execution time Memory
645088 2022-09-26T08:13:33 Z ghostwriter Palindromic Partitions (CEOI17_palindromic) C++14
100 / 100
 241 ms 28888 KB 
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#endif
#define ft front
#define bk back
#define st first
#define nd second
#define ins insert
#define ers erase
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define mtp make_tuple
#define bg begin
#define ed end
#define all(x) (x).bg(), (x).ed()
#define sz(x) (int)(x).size()
typedef long long ll; typedef unsigned long long ull;
typedef double db; typedef long double ldb;
typedef pair<int, int> pi; typedef pair<ll, ll> pll;
typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll;
typedef string str;
template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
#define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
#define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define FSN(i, n) for (int (i) = (n) - 1; (i) >= 0; --(i))
#define EACH(i, x) for (auto &(i) : (x))
#define WHILE while
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Tran The Bao - ghostwriter
    Training for VOI23 gold medal
----------------------------------------------------------------
    DIT ME CHUYEN BAO LOC
----------------------------------------------------------------
*/
const pi M = {1e9 + 7, 1e9 + 9};
const pi base = {37, 127};
const int N = 1e6 + 5;
int t, n;
pi H[N], P[N];
str s;
pi get(int l, int r) {
    pi ans;
    ans.st = (H[r].st - 1LL * H[l - 1].st * P[r - l + 1].st % M.st + M.st) % M.st;
    ans.nd = (H[r].nd - 1LL * H[l - 1].nd * P[r - l + 1].nd % M.nd + M.nd) % M.nd;
    return ans;
}
void solve() {
	cin >> s;
	n = sz(s);
	s = "#" + s + "#";
    P[0] = {1, 1};
	FOR(i, 1, n) {
        P[i].st = 1LL * P[i - 1].st * base.st % M.st;
        P[i].nd = 1LL * P[i - 1].nd * base.nd % M.nd;
        H[i].st = (1LL * H[i - 1].st * base.st % M.st + s[i] - 'a' + 1) % M.st;
        H[i].nd = (1LL * H[i - 1].nd * base.nd % M.nd + s[i] - 'a' + 1) % M.nd;
    }
    int l = 1, r = n, rs = 0;
    WHILE(l <= r) {
        int pos = 0;
        int mid = (l + r) / 2 - ((r - l + 1) & 1? 1 : 0);
        FOR(i, l, mid) {
            int len = i - l + 1;
            pi left = get(l, i), right = get(r - len + 1, r);
            if (left == right) {
                pos = i;
                break;
            }
        }
        if (!pos) {
            ++rs;
            break;
        }
        rs += 2;
        int len = pos - l + 1;
        l += len;
        r -= len;
    }
    cout << rs << '\n';
}
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);
    cin >> t;
    WHILE(t--) solve();
    return 0;
}
/*
4
bonobo
deleted
racecar
racecars
----------------------------------------------------------------
From Benq:
    stuff you should look for
        * int overflow, array bounds
        * special cases (n=1?)
        * do smth instead of nothing and stay organized
        * WRITE STUFF DOWN
        * DON'T GET STUCK ON ONE APPROACH
----------------------------------------------------------------
*/

Compilation message

palindromic.cpp: In function 'void solve()':
palindromic.cpp:30:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
palindromic.cpp:66:2: note: in expansion of macro 'FOR'
   66 |  FOR(i, 1, n) {
      |  ^~~
palindromic.cpp:30:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   30 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
palindromic.cpp:76:9: note: in expansion of macro 'FOR'
   76 |         FOR(i, l, mid) {
      |         ^~~

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 340 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 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 340 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 336 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 340 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 3 ms 596 KB Output is correct
11 Correct 2 ms 596 KB Output is correct
12 Correct 3 ms 604 KB Output is correct
13 Correct 3 ms 552 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 340 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 3 ms 596 KB Output is correct
11 Correct 2 ms 596 KB Output is correct
12 Correct 3 ms 604 KB Output is correct
13 Correct 3 ms 552 KB Output is correct
14 Correct 241 ms 28784 KB Output is correct
15 Correct 125 ms 23340 KB Output is correct
16 Correct 226 ms 28888 KB Output is correct
17 Correct 124 ms 15176 KB Output is correct