제출 #874194

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
874194		vjudge1	Necklace (Subtask 1-3) (BOI19_necklace1)	C++17	5 / 85	1535 ms	2816 KiB

necklace

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

const int PRI = 41;
const int MOD = 2000000011;

int mul(int a, int b) {
    return (1LL * a * b) % MOD;
}

int add(int a, int b) {
    return (0LL + a + b) % MOD;
}

int hasher(string s) {
    int res = 0;
    for(int i = 0; i < int(s.size()); i++) {
        res = mul(res, PRI);
        res = add(res, (s[i] - 'a' +1));
    }

    return res;
}

int stra[405][405], strb[405][405];
int reva[405][405], revb[405][405];

#define ONLINE_JUDGE
void solve() {
    string a, b;
    cin >> a >> b;
    int n = int(a.size()), m = int(b.size());

    for(int len = n; len >= 1; len--) {
        for(int l = 0; l + len -1 < n; l++) {
            stra[l][l + len -1] = hasher(a.substr(l, len));
        }
    }

    for(int len = m; len >= 1; len--) {
        for(int l = 0; l + len -1 < m; l++) {
            strb[l][l + len -1] = hasher(b.substr(l, len));
        }
    }

    for(int len = n; len >= 1; len--) {
        for(int l = 0; l + len -1 < n; l++) {
            reverse(a.begin() + l, a.begin() + l + len);
            reva[l][l + len -1] = hasher(a.substr(l, len));
            reverse(a.begin() + l, a.begin() + l + len);
        }
    }

    for(int len = min(n, m); len >= 1; len--) {
        for(int l = 0; l + len -1 < n; l++) {
            for(int r = 0; r + len -1 < m; r++) {
                for(int k = 0; k <= len; k++) {
                    //string x = a.substr(l, len);
                    //reverse(x.begin(), x.end());

                    //cerr << len << " -> " << x.substr(0, k) << " " << b.substr(r + len - k, k) << " :: " << x.substr(k, len - k) << " " << b.substr(r, len - k) << "\n";
                    //cerr << len << " -> " << reva[l][l + k -1] << " " << strb[r][r + k -1] << " :: " << reva[l + k][l + len -1] << " " << strb[r + k][r + len - 1] << "\n";
                    if(reva[l][l + k -1] == strb[r][r + k -1] && reva[l + k][l + len -1] == strb[r + k][r + len -1]) {
                        cout << len << "\n";
                        cout << l << " " << r << "\n";
                        return;
                    }

                    //cerr << len << " -> " << a.substr(l, k) << " " << b.substr(r + len - k, k) << " :: " << a.substr(l + k, len - k) << " " << b.substr(r, len - k) << "\n";
                    if(stra[l][l + k -1] == strb[r][r + k -1] && stra[l + k][l + len -1] == strb[r + k][r + len -1]) {
                        cout << len << "\n";
                        cout << l << " " << r << "\n";
                        return;
                    }
                }
            }
        }
    }

    cout << 0 << "\n";
    cout << 0 << " " << 0 << "\n";
    
    return;
}

signed main() {
    #ifndef ONLINE_JUDGE
        freopen(".in", "r", stdin);
        freopen(".out", "w", stdout);
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int t = 1; //cin >> t;
    for(int i = 1; i <= t; i++) {
        solve();
    }

    return 0;
}

• Subtask 1: 5 / 25
• Subtask 2: 0 / 20
• Subtask 3: 0 / 40