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Submission #955797

# Submission time Handle Problem Language Result Execution time Memory
955797 2024-03-31T12:28:55 Z Neco_arc Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 107 ms 28756 KB 
#include <bits/stdc++.h>

#define ll long long
#define ull unsigned long long
#define all(x) x.begin(), x.end()
#define Neco "Palindromic Partitions"
#define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin())
#define getbit(x,i) ((x >> i)&1)
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define cntbit(x) __builtin_popcountll(x)
#define fi(i, a, b) for(int i = a; i <= b; i++)
#define fid(i, a, b) for(int i = a; i >= b; i--)
#define maxn (int) 1e6 + 7

using namespace std;

const ll mod = 972663749;
const ll base = 911382323;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

ll GetRandom(ll l, ll r)
{
    return uniform_int_distribution<ll> (l, r)(rng);
}

int n;
ll H[maxn], pw[maxn];
string a;

ll get(int l, int r) {
    return (H[r] - H[l - 1] * pw[r - l + 1] + mod * mod) % mod;
}

void solve()
{

    cin >> a;
    n = a.size(), a = ' ' + a;

    fi(i, 1, n) H[i] = (H[i - 1] * base + a[i] - 'a') % mod;

    int l = 1, r = n;

//    cout << get(3, 3) << " " << get(5, 5);

//
    int ans = 0;
    while(l <= r)
    {
        int R = l, L = r;
        while(R < L) {
            if(get(l, R) != get(L, r)) ++R, --L;
            else
            {
                l = R + 1, r = L - 1;
                ans += 2;
                break;
            }
        }

        if(R >= L) {
            ans ++;
            break;
        }
    }

    cout << ans << '\n';

}


int main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if(fopen(Neco".inp", "r")) {
        freopen(Neco".inp", "r", stdin);
        freopen(Neco".out", "w", stdout);
    }


    int nTest = 1;
    cin >> nTest;

    pw[0] = 1;
    fi(i, 1, maxn - 2) pw[i] = (pw[i - 1] * base) % mod;

    while(nTest--)
    {
        solve();
    }


    return 0;
}

Compilation message

palindromic.cpp: In function 'int main()':
palindromic.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(Neco".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8796 KB Output is correct
2 Correct 5 ms 8796 KB Output is correct
3 Correct 6 ms 8844 KB Output is correct
4 Correct 6 ms 8796 KB Output is correct
5 Correct 6 ms 8792 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8796 KB Output is correct
2 Correct 5 ms 8796 KB Output is correct
3 Correct 6 ms 8844 KB Output is correct
4 Correct 6 ms 8796 KB Output is correct
5 Correct 6 ms 8792 KB Output is correct
6 Correct 5 ms 8792 KB Output is correct
7 Correct 6 ms 8796 KB Output is correct
8 Correct 7 ms 8844 KB Output is correct
9 Correct 7 ms 8852 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8796 KB Output is correct
2 Correct 5 ms 8796 KB Output is correct
3 Correct 6 ms 8844 KB Output is correct
4 Correct 6 ms 8796 KB Output is correct
5 Correct 6 ms 8792 KB Output is correct
6 Correct 5 ms 8792 KB Output is correct
7 Correct 6 ms 8796 KB Output is correct
8 Correct 7 ms 8844 KB Output is correct
9 Correct 7 ms 8852 KB Output is correct
10 Correct 6 ms 8796 KB Output is correct
11 Correct 6 ms 8936 KB Output is correct
12 Correct 6 ms 8796 KB Output is correct
13 Correct 7 ms 8856 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8796 KB Output is correct
2 Correct 5 ms 8796 KB Output is correct
3 Correct 6 ms 8844 KB Output is correct
4 Correct 6 ms 8796 KB Output is correct
5 Correct 6 ms 8792 KB Output is correct
6 Correct 5 ms 8792 KB Output is correct
7 Correct 6 ms 8796 KB Output is correct
8 Correct 7 ms 8844 KB Output is correct
9 Correct 7 ms 8852 KB Output is correct
10 Correct 6 ms 8796 KB Output is correct
11 Correct 6 ms 8936 KB Output is correct
12 Correct 6 ms 8796 KB Output is correct
13 Correct 7 ms 8856 KB Output is correct
14 Correct 107 ms 27760 KB Output is correct
15 Correct 59 ms 22812 KB Output is correct
16 Correct 98 ms 28756 KB Output is correct
17 Correct 57 ms 18904 KB Output is correct