oj.uz

Submission #678714

# Submission time Handle Problem Language Result Execution time Memory
678714 2023-01-06T12:06:59 Z stevancv Palindromic Partitions (CEOI17_palindromic) C++14
100 / 100
 243 ms 24688 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 1e6 + 2;
const int mod = 1e9 + 7;
int Add(int a, int b) {
    a += b;
    if (a >= mod) a -= mod;
    return a;
}
int Sub(int a, int b) {
    a -= b;
    if (a < 0) a += mod;
    return a;
}
int Mul(int a, int b) {
    ll c = a; c *= b; c %= mod;
    return c;
}
int Exp(int a, int b) {
    int ans = 1;
    while (b > 0) {
        if (b & 1) ans = Mul(ans, a);
        a = Mul(a, a);
        b >>= 1;
    }
    return ans;
}
int p[N], pw[N], inv[N];
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    pw[0] = inv[0] = 1;
    for (int i = 1; i < N; i++) {
        pw[i] = Mul(pw[i - 1], 26);
        inv[i] = Exp(pw[i], mod - 2);
    }
    int tt; cin >> tt;
    while (tt--) {
        string s; cin >> s;
        int n = s.size();
        for (int i = 0; i < n; i++) {
            p[i] = Mul(pw[i], s[i] - 'a');
            if (i > 0) p[i] = Add(p[i - 1], p[i]);
        }
        auto Get = [&] (int l, int r) {
            if (l == 0) return p[r];
            return Mul(inv[l], Sub(p[r], p[l - 1]));
        };
        int l = 0, r = n - 1, ans = 0;
        while (l <= r) {
            if (l == r) {
                ans += 1;
                break;
            }
            int f = 0;
            for (int d = 1; 2 * d < r - l + 2; d++) {
                if (Get(l, l + d - 1) == Get(r - d + 1, r)) {
                    ans += 2;
                    l = l + d;
                    r = r - d;
                    f = 1;
                    break;
                }
            }
            if (f == 0) {
                ans += 1;
                break;
            }
        }
        cout << ans << en;
    }
    return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 158 ms 8204 KB Output is correct
2 Correct 159 ms 8096 KB Output is correct
3 Correct 169 ms 8024 KB Output is correct
4 Correct 164 ms 8204 KB Output is correct
5 Correct 157 ms 8028 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 158 ms 8204 KB Output is correct
2 Correct 159 ms 8096 KB Output is correct
3 Correct 169 ms 8024 KB Output is correct
4 Correct 164 ms 8204 KB Output is correct
5 Correct 157 ms 8028 KB Output is correct
6 Correct 157 ms 8052 KB Output is correct
7 Correct 160 ms 8068 KB Output is correct
8 Correct 163 ms 8040 KB Output is correct
9 Correct 156 ms 8064 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 158 ms 8204 KB Output is correct
2 Correct 159 ms 8096 KB Output is correct
3 Correct 169 ms 8024 KB Output is correct
4 Correct 164 ms 8204 KB Output is correct
5 Correct 157 ms 8028 KB Output is correct
6 Correct 157 ms 8052 KB Output is correct
7 Correct 160 ms 8068 KB Output is correct
8 Correct 163 ms 8040 KB Output is correct
9 Correct 156 ms 8064 KB Output is correct
10 Correct 167 ms 8284 KB Output is correct
11 Correct 166 ms 8164 KB Output is correct
12 Correct 161 ms 8204 KB Output is correct
13 Correct 167 ms 8268 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 158 ms 8204 KB Output is correct
2 Correct 159 ms 8096 KB Output is correct
3 Correct 169 ms 8024 KB Output is correct
4 Correct 164 ms 8204 KB Output is correct
5 Correct 157 ms 8028 KB Output is correct
6 Correct 157 ms 8052 KB Output is correct
7 Correct 160 ms 8068 KB Output is correct
8 Correct 163 ms 8040 KB Output is correct
9 Correct 156 ms 8064 KB Output is correct
10 Correct 167 ms 8284 KB Output is correct
11 Correct 166 ms 8164 KB Output is correct
12 Correct 161 ms 8204 KB Output is correct
13 Correct 167 ms 8268 KB Output is correct
14 Correct 243 ms 24688 KB Output is correct
15 Correct 209 ms 19436 KB Output is correct
16 Correct 235 ms 23600 KB Output is correct
17 Correct 215 ms 17056 KB Output is correct