結果

問題 No.2858 Make a Palindrome
ユーザー 👑 rin204rin204
提出日時 2024-08-25 15:27:49
言語 C++23
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 12,598 bytes
コンパイル時間 3,369 ms
コンパイル使用メモリ 259,912 KB
実行使用メモリ 14,168 KB
最終ジャッジ日時 2024-08-25 15:27:56
合計ジャッジ時間 6,282 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge3
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 55 ms
6,812 KB
testcase_01 AC 57 ms
6,944 KB
testcase_02 AC 61 ms
6,944 KB
testcase_03 AC 58 ms
6,944 KB
testcase_04 AC 58 ms
6,944 KB
testcase_05 AC 52 ms
6,940 KB
testcase_06 AC 35 ms
6,944 KB
testcase_07 WA -
testcase_08 WA -
testcase_09 AC 34 ms
6,948 KB
testcase_10 WA -
testcase_11 WA -
testcase_12 AC 43 ms
6,944 KB
testcase_13 AC 43 ms
6,944 KB
testcase_14 AC 48 ms
6,944 KB
testcase_15 AC 32 ms
6,944 KB
testcase_16 AC 30 ms
6,940 KB
testcase_17 AC 32 ms
6,940 KB
testcase_18 AC 30 ms
6,940 KB
testcase_19 AC 32 ms
6,940 KB
testcase_20 AC 33 ms
12,900 KB
testcase_21 AC 34 ms
12,980 KB
testcase_22 AC 20 ms
8,216 KB
testcase_23 AC 39 ms
12,912 KB
testcase_24 AC 31 ms
11,856 KB
testcase_25 AC 28 ms
11,048 KB
testcase_26 AC 27 ms
11,020 KB
testcase_27 AC 37 ms
13,956 KB
testcase_28 AC 31 ms
11,640 KB
testcase_29 AC 37 ms
13,268 KB
testcase_30 AC 35 ms
13,956 KB
testcase_31 AC 36 ms
13,924 KB
testcase_32 AC 37 ms
14,124 KB
testcase_33 AC 37 ms
13,952 KB
testcase_34 AC 36 ms
13,984 KB
testcase_35 AC 39 ms
13,944 KB
testcase_36 AC 38 ms
14,016 KB
testcase_37 AC 39 ms
14,168 KB
testcase_38 AC 45 ms
13,992 KB
testcase_39 AC 41 ms
14,008 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
// #define INTERACTIVE

#include <bits/stdc++.h>
using namespace std;

namespace templates {
// type
using ll  = long long;
using ull = unsigned long long;
using Pii = pair<int, int>;
using Pil = pair<int, ll>;
using Pli = pair<ll, int>;
using Pll = pair<ll, ll>;
template <class T>
using pq = priority_queue<T>;
template <class T>
using qp = priority_queue<T, vector<T>, greater<T>>;
// clang-format off
#define vec(T, A, ...) vector<T> A(__VA_ARGS__);
#define vvec(T, A, h, ...) vector<vector<T>> A(h, vector<T>(__VA_ARGS__));
#define vvvec(T, A, h1, h2, ...) vector<vector<vector<T>>> A(h1, vector<vector<T>>(h2, vector<T>(__VA_ARGS__)));
// clang-format on

// for loop
#define fori1(a) for (ll _ = 0; _ < (a); _++)
#define fori2(i, a) for (ll i = 0; i < (a); i++)
#define fori3(i, a, b) for (ll i = (a); i < (b); i++)
#define fori4(i, a, b, c) for (ll i = (a); ((c) > 0 || i > (b)) && ((c) < 0 || i < (b)); i += (c))
#define overload4(a, b, c, d, e, ...) e
#define fori(...) overload4(__VA_ARGS__, fori4, fori3, fori2, fori1)(__VA_ARGS__)

// declare and input
// clang-format off
#define INT(...) int __VA_ARGS__; inp(__VA_ARGS__);
#define LL(...) ll __VA_ARGS__; inp(__VA_ARGS__);
#define STRING(...) string __VA_ARGS__; inp(__VA_ARGS__);
#define CHAR(...) char __VA_ARGS__; inp(__VA_ARGS__);
#define DOUBLE(...) double __VA_ARGS__; STRING(str___); __VA_ARGS__ = stod(str___);
#define VEC(T, A, n) vector<T> A(n); inp(A);
#define VVEC(T, A, n, m) vector<vector<T>> A(n, vector<T>(m)); inp(A);
// clang-format on

// const value
const ll MOD1   = 1000000007;
const ll MOD9   = 998244353;
const double PI = acos(-1);

// other macro
#if !defined(RIN__LOCAL) && !defined(INTERACTIVE)
#define endl "\n"
#endif
#define spa ' '
#define len(A) ll(A.size())
#define all(A) begin(A), end(A)

// function
vector<char> stoc(string &S) {
    int n = S.size();
    vector<char> ret(n);
    for (int i = 0; i < n; i++) ret[i] = S[i];
    return ret;
}
string ctos(vector<char> &S) {
    int n      = S.size();
    string ret = "";
    for (int i = 0; i < n; i++) ret += S[i];
    return ret;
}

template <class T>
auto min(const T &a) {
    return *min_element(all(a));
}
template <class T>
auto max(const T &a) {
    return *max_element(all(a));
}
template <class T, class S>
auto clamp(T &a, const S &l, const S &r) {
    return (a > r ? r : a < l ? l : a);
}
template <class T, class S>
inline bool chmax(T &a, const S &b) {
    return (a < b ? a = b, 1 : 0);
}
template <class T, class S>
inline bool chmin(T &a, const S &b) {
    return (a > b ? a = b, 1 : 0);
}
template <class T, class S>
inline bool chclamp(T &a, const S &l, const S &r) {
    auto b = clamp(a, l, r);
    return (a != b ? a = b, 1 : 0);
}

template <typename T>
T sum(vector<T> &A) {
    T tot = 0;
    for (auto a : A) tot += a;
    return tot;
}

template <typename T>
vector<T> compression(vector<T> X) {
    sort(all(X));
    X.erase(unique(all(X)), X.end());
    return X;
}

// input and output
namespace io {
// __int128_t
std::ostream &operator<<(std::ostream &dest, __int128_t value) {
    std::ostream::sentry s(dest);
    if (s) {
        __uint128_t tmp = value < 0 ? -value : value;
        char buffer[128];
        char *d = std::end(buffer);
        do {
            --d;
            *d = "0123456789"[tmp % 10];
            tmp /= 10;
        } while (tmp != 0);
        if (value < 0) {
            --d;
            *d = '-';
        }
        int len = std::end(buffer) - d;
        if (dest.rdbuf()->sputn(d, len) != len) {
            dest.setstate(std::ios_base::badbit);
        }
    }
    return dest;
}

// vector<T>
template <typename T>
istream &operator>>(istream &is, vector<T> &A) {
    for (auto &a : A) is >> a;
    return is;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        os << A[i];
        if (i != A.size() - 1) os << ' ';
    }
    return os;
}

// vector<vector<T>>
template <typename T>
istream &operator>>(istream &is, vector<vector<T>> &A) {
    for (auto &a : A) is >> a;
    return is;
}
template <typename T>
ostream &operator<<(ostream &os, vector<vector<T>> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        os << A[i];
        if (i != A.size() - 1) os << endl;
    }
    return os;
}

// pair<S, T>
template <typename S, typename T>
istream &operator>>(istream &is, pair<S, T> &A) {
    is >> A.first >> A.second;
    return is;
}
template <typename S, typename T>
ostream &operator<<(ostream &os, pair<S, T> &A) {
    os << A.first << ' ' << A.second;
    return os;
}

// vector<pair<S, T>>
template <typename S, typename T>
istream &operator>>(istream &is, vector<pair<S, T>> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        is >> A[i];
    }
    return is;
}
template <typename S, typename T>
ostream &operator<<(ostream &os, vector<pair<S, T>> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        os << A[i];
        if (i != A.size() - 1) os << endl;
    }
    return os;
}

// tuple
template <typename T, size_t N>
struct TuplePrint {
    static ostream &print(ostream &os, const T &t) {
        TuplePrint<T, N - 1>::print(os, t);
        os << ' ' << get<N - 1>(t);
        return os;
    }
};
template <typename T>
struct TuplePrint<T, 1> {
    static ostream &print(ostream &os, const T &t) {
        os << get<0>(t);
        return os;
    }
};
template <typename... Args>
ostream &operator<<(ostream &os, const tuple<Args...> &t) {
    TuplePrint<decltype(t), sizeof...(Args)>::print(os, t);
    return os;
}

// io functions
void FLUSH() {
    cout << flush;
}

void print() {
    cout << endl;
}
template <class Head, class... Tail>
void print(Head &&head, Tail &&...tail) {
    cout << head;
    if (sizeof...(Tail)) cout << spa;
    print(std::forward<Tail>(tail)...);
}

template <typename T, typename S>
void prisep(vector<T> &A, S sep) {
    int n = A.size();
    for (int i = 0; i < n; i++) {
        cout << A[i];
        if (i != n - 1) cout << sep;
    }
    cout << endl;
}
template <typename T, typename S>
void priend(T A, S end) {
    cout << A << end;
}
template <typename T>
void prispa(T A) {
    priend(A, spa);
}
template <typename T, typename S>
bool printif(bool f, T A, S B) {
    if (f)
        print(A);
    else
        print(B);
    return f;
}

template <class... T>
void inp(T &...a) {
    (cin >> ... >> a);
}

} // namespace io
using namespace io;

// read graph
vector<vector<int>> read_edges(int n, int m, bool direct = false, int indexed = 1) {
    vector<vector<int>> edges(n, vector<int>());
    for (int i = 0; i < m; i++) {
        INT(u, v);
        u -= indexed;
        v -= indexed;
        edges[u].push_back(v);
        if (!direct) edges[v].push_back(u);
    }
    return edges;
}
vector<vector<int>> read_tree(int n, int indexed = 1) {
    return read_edges(n, n - 1, false, indexed);
}

template <typename T = long long>
vector<vector<pair<int, T>>> read_wedges(int n, int m, bool direct = false, int indexed = 1) {
    vector<vector<pair<int, T>>> edges(n, vector<pair<int, T>>());
    for (int i = 0; i < m; i++) {
        INT(u, v);
        T w;
        inp(w);
        u -= indexed;
        v -= indexed;
        edges[u].push_back({v, w});
        if (!direct) edges[v].push_back({u, w});
    }
    return edges;
}
template <typename T = long long>
vector<vector<pair<int, T>>> read_wtree(int n, int indexed = 1) {
    return read_wedges<T>(n, n - 1, false, indexed);
}

// yes / no
namespace yesno {

// yes
inline bool yes(bool f = true) {
    cout << (f ? "yes" : "no") << endl;
    return f;
}
inline bool Yes(bool f = true) {
    cout << (f ? "Yes" : "No") << endl;
    return f;
}
inline bool YES(bool f = true) {
    cout << (f ? "YES" : "NO") << endl;
    return f;
}

// no
inline bool no(bool f = true) {
    cout << (!f ? "yes" : "no") << endl;
    return f;
}
inline bool No(bool f = true) {
    cout << (!f ? "Yes" : "No") << endl;
    return f;
}
inline bool NO(bool f = true) {
    cout << (!f ? "YES" : "NO") << endl;
    return f;
}

// possible
inline bool possible(bool f = true) {
    cout << (f ? "possible" : "impossible") << endl;
    return f;
}
inline bool Possible(bool f = true) {
    cout << (f ? "Possible" : "Impossible") << endl;
    return f;
}
inline bool POSSIBLE(bool f = true) {
    cout << (f ? "POSSIBLE" : "IMPOSSIBLE") << endl;
    return f;
}

// impossible
inline bool impossible(bool f = true) {
    cout << (!f ? "possible" : "impossible") << endl;
    return f;
}
inline bool Impossible(bool f = true) {
    cout << (!f ? "Possible" : "Impossible") << endl;
    return f;
}
inline bool IMPOSSIBLE(bool f = true) {
    cout << (!f ? "POSSIBLE" : "IMPOSSIBLE") << endl;
    return f;
}

// Alice Bob
inline bool Alice(bool f = true) {
    cout << (f ? "Alice" : "Bob") << endl;
    return f;
}
inline bool Bob(bool f = true) {
    cout << (f ? "Bob" : "Alice") << endl;
    return f;
}

// Takahashi Aoki
inline bool Takahashi(bool f = true) {
    cout << (f ? "Takahashi" : "Aoki") << endl;
    return f;
}
inline bool Aoki(bool f = true) {
    cout << (f ? "Aoki" : "Takahashi") << endl;
    return f;
}

} // namespace yesno
using namespace yesno;

} // namespace templates
using namespace templates;

std::vector<int> manacher(const std::string &S) {
    std::string T;
    int n = S.size();
    for (int i = 0; i < n; i++) {
        T += S[i];
        if (i != n - 1) T += char(1);
    }
    n = 2 * n - 1;
    std::vector<int> L(n, 0);
    int i = 0;
    int j = 0;
    while (i < n) {
        while (i >= j && i + j < n && T[i - j] == T[i + j]) {
            j++;
        }
        L[i]  = j;
        int k = 1;
        while (k + L[i - k] < j && k <= i && i + k < n) {
            L[i + k] = L[i - k];
            k++;
        }
        i += k;
        j -= k;
    }
    for (int i = 0; i < n; i++) {
        int l = 2 * L[i] - 1;
        if (i % 2 == 0)
            L[i] = 2 * (l / 4) + 1;
        else
            L[i] = 2 * ((l + 1) / 4);
    }
    return L;
}

void solve() {
    LL(n, m);
    STRING(S);
    auto T = S;
    reverse(all(T));
    if (S == T) {
        print((m + n - 1) / n);
        return;
    }

    T = S;
    vec(int, length, 0);
    fori(i, 1, 5) {
        auto res = manacher(T);
        int ma   = max(res);
        if (ma >= m) {
            print(i);
            return;
        }
        length.push_back(ma);
        T += S;
    }
    const ll inf = 1LL << 60;
    ll ans       = inf;
    if (length[3] - length[1] == 2 * n) {
        ll tmp = 4;
        ll d   = m - length[3];
        tmp += (d + 2 * n - 1) / (2 * n) * 2;
        chmin(ans, tmp);
    }
    if (length[2] - length[0] == 2 * n) {
        ll tmp = 3;
        ll d   = m - length[2];
        tmp += (d + 2 * n - 1) / (2 * n) * 2;
        chmin(ans, tmp);
    }

    if (ans == inf) ans = -1;
    print(ans);
}

int main() {
#ifndef INTERACTIVE
    std::cin.tie(0)->sync_with_stdio(0);
#endif
    // std::cout << std::fixed << std::setprecision(12);
    int t;
    t = 1;
    std::cin >> t;
    while (t--) solve();
    return 0;
}

// // #pragma GCC target("avx2")
// // #pragma GCC optimize("O3")
// // #pragma GCC optimize("unroll-loops")
// // #define INTERACTIVE
//
// #include "kyopro-cpp/template.hpp"
//
// #include "string/manacher.hpp"
//
// void solve() {
//     LL(n, m);
//     STRING(S);
//     auto T = S;
//     reverse(all(T));
//     if (S == T) {
//         print((m + n - 1) / n);
//         return;
//     }
//
//     T = S;
//     vec(int, length, 0);
//     fori(i, 1, 5) {
//         auto res = manacher(T);
//         int ma   = max(res);
//         if (ma >= m) {
//             print(i);
//             return;
//         }
//         length.push_back(ma);
//         T += S;
//     }
//     const ll inf = 1LL << 60;
//     ll ans       = inf;
//     if (length[3] - length[1] == 2 * n) {
//         ll tmp = 4;
//         ll d   = m - length[3];
//         tmp += (d + 2 * n - 1) / (2 * n) * 2;
//         chmin(ans, tmp);
//     }
//     if (length[2] - length[0] == 2 * n) {
//         ll tmp = 3;
//         ll d   = m - length[2];
//         tmp += (d + 2 * n - 1) / (2 * n) * 2;
//         chmin(ans, tmp);
//     }
//
//     if (ans == inf) ans = -1;
//     print(ans);
// }
//
// int main() {
// #ifndef INTERACTIVE
//     std::cin.tie(0)->sync_with_stdio(0);
// #endif
//     // std::cout << std::fixed << std::setprecision(12);
//     int t;
//     t = 1;
//     std::cin >> t;
//     while (t--) solve();
//     return 0;
// }
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