結果

問題 No.1005 BOT対策
コンテスト
ユーザー ningenMe
提出日時 2020-03-08 03:48:08
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 4,320 bytes
コンパイル時間 1,408 ms
コンパイル使用メモリ 171,372 KB
実行使用メモリ 7,848 KB
最終ジャッジ日時 2025-06-20 00:50:22
合計ジャッジ時間 2,257 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 29
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 # 

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;

#define REP(i,n) for(long long i = 0; i < (n); i++)
#define FOR(i, m, n) for(long long i = (m);i < (n); ++i)
#define ALL(obj) (obj).begin(),(obj).end()
#define SPEED cin.tie(0);ios::sync_with_stdio(false);

template<class T> using V = vector<T>;
template<class T, class U> using P = pair<T, U>;
template<class T> using PQ = priority_queue<T>;
template<class T> using PQR = priority_queue<T,vector<T>,greater<T>>;

constexpr long long MOD = (long long)1e9 + 7;
constexpr long long MOD2 = 998244353;
constexpr long long HIGHINF = (long long)1e18;
constexpr long long LOWINF = (long long)1e15;
constexpr long double PI = 3.1415926535897932384626433;

template <class T> vector<T> multivector(size_t N,T init){return vector<T>(N,init);}
template <class... T> auto multivector(size_t N,T... t){return vector<decltype(multivector(t...))>(N,multivector(t...));}
template <class T> void corner(bool flg, T hoge) {if (flg) {cout << hoge << endl; exit(0);}}
template <class T, class U>ostream &operator<<(ostream &o, const map<T, U>&obj) {o << "{"; for (auto &x : obj) o << " {" << x.first << " : " << x.second << "}" << ","; o << " }"; return o;}
template <class T>ostream &operator<<(ostream &o, const set<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const multiset<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const vector<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "") << obj[i]; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const deque<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "") << obj[i]; o << "}"; return o;}
template <class T, class U>ostream &operator<<(ostream &o, const pair<T, U>&obj) {o << "{" << obj.first << ", " << obj.second << "}"; return o;}
template <template <class tmp>  class T, class U> ostream &operator<<(ostream &o, const T<U> &obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr)o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
void print(void) {cout << endl;}
template <class Head> void print(Head&& head) {cout << head;print();}
template <class Head, class... Tail> void print(Head&& head, Tail&&... tail) {cout << head << " ";print(forward<Tail>(tail)...);}
template <class T> inline void chmax(T& a, const T b){a=max(a,b);}
template <class T> inline void chmin(T& a, const T b){a=min(a,b);}
void YN(bool flg) {cout << (flg ? "YES" : "NO") << endl;}
void Yn(bool flg) {cout << (flg ? "Yes" : "No") << endl;}
void yn(bool flg) {cout << (flg ? "yes" : "no") << endl;}

class RollingHash {
private:
    long long base1,base2;
    long long mod1,mod2;
    vector<long long> hash1,hash2,pow1,pow2;
 
public: 
    RollingHash(const string& S) : base1(1009), base2(1007), mod1(1000000007), mod2(1000000009) {
        int N = S.size();
        hash1.resize(N+1,0);
        hash2.resize(N+1,0);
        pow1.resize(N+1,1);
        pow2.resize(N+1,1);
 
        for(int i=1; i<=N; ++i) {
            hash1[i] = ((hash1[i-1]+S[i-1]) * base1) % mod1;
            hash2[i] = ((hash2[i-1]+S[i-1]) * base2) % mod2;
            pow1[i] = (pow1[i-1] * base1) % mod1;
            pow2[i] = (pow2[i-1] * base2) % mod2;
        }
    }

	//[l,r)
    pair<long long, long long> get(int l,int r) {
        long long t1 = ((hash1[r] - hash1[l] * pow1[r-l]) % mod1 + mod1) % mod1;
        long long t2 = ((hash2[r] - hash2[l] * pow2[r-l]) % mod2 + mod2) % mod2;
        return {t1,t2};
    }
};

//verify
//https://atcoder.jp/contests/abc141/tasks/abc141_e

int main() {
    string S,T,U; cin >> S >> T;
    U = S + "#" + T;
    int n = S.size();
    int m = T.size();
    int ans = 0;
    RollingHash rh(U);
    for(int i = 0; i < n; ++i) {
        if(m>1){
            if(rh.get(i,i+m) == rh.get(n+1,n+1+m)) {
                i += m-2;
                ans++;
            }
        }
        else{
            if(S[i]==T[0]) ans=-1;
        }
    }
    cout << ans << endl;
	return 0;
}
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