結果

問題 No.2454 Former < Latter
ユーザー noya2noya2
提出日時 2023-09-01 23:32:14
言語 C++23
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 77 ms / 2,000 ms
コード長 7,651 bytes
コンパイル時間 3,195 ms
コンパイル使用メモリ 252,844 KB
実行使用メモリ 8,664 KB
最終ジャッジ日時 2023-09-01 23:32:25
合計ジャッジ時間 5,716 ms
ジャッジサーバーID
（参考情報） 		judge14 / judge15
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 2 ms
4,380 KB
testcase_01 AC 2 ms
4,380 KB
testcase_02 AC 74 ms
8,592 KB
testcase_03 AC 75 ms
8,600 KB
testcase_04 AC 75 ms
8,584 KB
testcase_05 AC 75 ms
8,664 KB
testcase_06 AC 73 ms
8,600 KB
testcase_07 AC 71 ms
8,532 KB
testcase_08 AC 32 ms
4,376 KB
testcase_09 AC 41 ms
4,796 KB
testcase_10 AC 48 ms
4,624 KB
testcase_11 AC 75 ms
8,520 KB
testcase_12 AC 77 ms
8,604 KB
testcase_13 AC 76 ms
8,588 KB
testcase_14 AC 75 ms
8,572 KB
testcase_15 AC 62 ms
6,084 KB
testcase_16 AC 62 ms
5,960 KB
testcase_17 AC 43 ms
4,380 KB
testcase_18 AC 22 ms
4,380 KB
testcase_19 AC 71 ms
8,660 KB
testcase_20 AC 72 ms
8,588 KB
testcase_21 AC 33 ms
4,384 KB
testcase_22 AC 43 ms
4,380 KB
testcase_23 AC 43 ms
4,800 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 # 

#line 2 "/Users/noya2/Desktop/Noya2_library/template/template.hpp"
using namespace std;

#include<bits/stdc++.h>
#line 1 "/Users/noya2/Desktop/Noya2_library/template/inout_old.hpp"
namespace noya2 {

template <typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &p){
    os << p.first << " " << p.second;
    return os;
}
template <typename T, typename U>
istream &operator>>(istream &is, pair<T, U> &p){
    is >> p.first >> p.second;
    return is;
}

template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v){
    int s = (int)v.size();
    for (int i = 0; i < s; i++) os << (i ? " " : "") << v[i];
    return os;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v){
    for (auto &x : v) is >> x;
    return is;
}

void in() {}
template <typename T, class... U>
void in(T &t, U &...u){
    cin >> t;
    in(u...);
}

void out() { cout << "\n"; }
template <typename T, class... U, char sep = ' '>
void out(const T &t, const U &...u){
    cout << t;
    if (sizeof...(u)) cout << sep;
    out(u...);
}

template<typename T>
void out(const vector<vector<T>> &vv){
    int s = (int)vv.size();
    for (int i = 0; i < s; i++) out(vv[i]);
}

struct IoSetup {
    IoSetup(){
        cin.tie(nullptr);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(15);
        cerr << fixed << setprecision(7);
    }
} iosetup_noya2;

} // namespace noya2
#line 1 "/Users/noya2/Desktop/Noya2_library/template/const.hpp"
namespace noya2{

const int iinf = 1'000'000'007;
const long long linf = 2'000'000'000'000'000'000LL;
const long long mod998 =  998244353;
const long long mod107 = 1000000007;
const long double pi = 3.14159265358979323;
const vector<int> dx = {0,1,0,-1,1,1,-1,-1};
const vector<int> dy = {1,0,-1,0,1,-1,-1,1};
const string ALP = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string alp = "abcdefghijklmnopqrstuvwxyz";
const string NUM = "0123456789";

void yes(){ cout << "Yes\n"; }
void no(){ cout << "No\n"; }
void YES(){ cout << "YES\n"; }
void NO(){ cout << "NO\n"; }
void yn(bool t){ t ? yes() : no(); }
void YN(bool t){ t ? YES() : NO(); }

} // namespace noya2
#line 1 "/Users/noya2/Desktop/Noya2_library/template/utils.hpp"
namespace noya2{

unsigned long long inner_binary_gcd(unsigned long long a, unsigned long long b){
    if (a == 0 || b == 0) return a + b;
    int n = __builtin_ctzll(a); a >>= n;
    int m = __builtin_ctzll(b); b >>= m;
    while (a != b) {
        int mm = __builtin_ctzll(a - b);
        bool f = a > b;
        unsigned long long c = f ? a : b;
        b = f ? b : a;
        a = (c - b) >> mm;
    }
    return a << min(n, m);
}

template<typename T> T gcd_fast(T a, T b){ return static_cast<T>(inner_binary_gcd(abs(a),abs(b))); }

long long sqrt_fast(long long n) {
    if (n <= 0) return 0;
    long long x = sqrt(n);
    while ((x + 1) * (x + 1) <= n) x++;
    while (x * x > n) x--;
    return x;
}

template<typename T> T floor_div(const T n, const T d) {
    assert(d != 0);
    return n / d - static_cast<T>((n ^ d) < 0 && n % d != 0);
}

template<typename T> T ceil_div(const T n, const T d) {
    assert(d != 0);
    return n / d + static_cast<T>((n ^ d) >= 0 && n % d != 0);
}

template<typename T> void uniq(vector<T> &v){
    sort(v.begin(),v.end());
    v.erase(unique(v.begin(),v.end()),v.end());
}

template <typename T, typename U> inline bool chmin(T &x, U y) { return (y < x) ? (x = y, true) : false; }

template <typename T, typename U> inline bool chmax(T &x, U y) { return (x < y) ? (x = y, true) : false; }

template<typename T> inline bool range(T l, T x, T r){ return l <= x && x < r; }

} // namespace noya2
#line 8 "/Users/noya2/Desktop/Noya2_library/template/template.hpp"

#define rep(i,n) for (int i = 0; i < (int)(n); i++)
#define repp(i,m,n) for (int i = (m); i < (int)(n); i++)
#define reb(i,n) for (int i = (int)(n-1); i >= 0; i--)
#define all(v) (v).begin(),(v).end()

using ll = long long;
using ld = long double;
using uint = unsigned int;
using ull = unsigned long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using pil = pair<int,ll>;
using pli = pair<ll,int>;

namespace noya2{

/*　~ (. _________ . /)　*/

}

using namespace noya2;


#line 2 "c.cpp"

#line 2 "/Users/noya2/Desktop/Noya2_library/string/rolling_hash.hpp"

#line 4 "/Users/noya2/Desktop/Noya2_library/string/rolling_hash.hpp"

namespace noya2{

struct RollingHash {
    using ull = unsigned long long;
    RollingHash(const string &s = ""){ build(s);}
    ull get(int l, int r){ 
        assert(0 <= l && l <= r && r <= n);
        return cal_mod(inner_hash[r] + POSITIVISER - mul_mod(inner_hash[l], pow_base[r-l]));
    }
    static ull get_hash(const string &s){
        int len = s.size();
        set_hash();
        extend_pow_base(len);
        ull res = 0;
        for (int i = 0; i < len; i++) res = cal_mod(mul_mod(res,BASE) + s[i]);
        return res;
    }
    template<class... Hash_Lengths> static ull concat(const Hash_Lengths&... hash_length){
        return inner_concat(0ULL,hash_length...);
    }
  private:
    static ull inner_concat(const ull& temp){
        return temp;
    }
    template<class... Tail> static ull inner_concat(const ull& temp, const ull& hash, const int& len, const Tail&... tail){
        return inner_concat(cal_mod(cal_mod(mul_mod(temp,pow_base[len]))+hash),tail...);
    }
    static constexpr ull MASK30 = (1ULL << 30) - 1;
    static constexpr ull MASK31 = (1ULL << 31) - 1;
    static constexpr ull MASK61 = (1ULL << 61) - 1;
    static constexpr ull MOD = (1ULL << 61) - 1;
    static constexpr ull POSITIVISER = MOD * 4;
    static ull BASE;
    static vector<ull> pow_base;
    static ull mul_mod(ull a, ull b){
        ull au = a >> 31, ad = a & MASK31;
        ull bu = b >> 31, bd = b & MASK31;
        ull mid = ad * bu + au * bd;
        ull midu = mid >> 30, midd = mid & MASK30;
        return (au * bu * 2 + midu + (midd << 31) + ad * bd);
    }
    static ull cal_mod(ull x){
        ull xu = x >> 61;
        ull xd = x & MASK61;
        ull res = xu + xd;
        if (res >= MOD) res -= MOD;
        return res;
    }
    static void set_hash(){
        if (BASE == 0) BASE = (1UL<<31) + (random_device()() & MASK31);
    }
    static void extend_pow_base(int len){
        int nlen = pow_base.size();
        if (nlen > len) return ;
        pow_base.resize(len+1);
        for (int i = nlen; i <= len; i++){
            pow_base[i] = cal_mod(mul_mod(pow_base[i-1],BASE));
        }
    }
    string str;
    int n;
    vector<ull> inner_hash;
    void build(const string &s){
        set_hash();
        str = s;
        n = s.size();
        extend_pow_base(n);
        inner_hash.resize(n+1);
        inner_hash[0] = 0;
        for (int i = 0; i < n; i++) inner_hash[i+1] = cal_mod(mul_mod(inner_hash[i],BASE) + s[i]);
    }
};
using ull = unsigned long long;
ull RollingHash::BASE = 0;
vector<ull> RollingHash::pow_base = vector<ull>(1,1);
using roriha = RollingHash;

} // namespace noya2
#line 4 "c.cpp"

void solve(){
    int n; in(n);
    string s; in(s);
    roriha hs(s);
    auto lcp = [&](int i){
        int le = 0, ri = min(n-i,i)+1;
        while (ri - le > 1){
            int md = (le + ri) / 2;
            if (hs.get(0,md) == hs.get(i,i+md)) le = md;
            else ri = md;
        }
        return le;
    };
    int ans = 0;
    repp(i,1,n){
        int l = lcp(i);
        int r1 = l, r2 = i+l;
        if (r2 == n) continue;
        if (r1 == i){
            ans++;
        }
        else {
            if (s[r1] < s[r2]) ans++;
        }
    }
    out(ans);
}

int main(){
    int t = 1; in(t);
    while (t--) { solve(); }
}
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