제출 #648530

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
648530		Lobo	Necklace (Subtask 1-3) (BOI19_necklace1)	C++17	5 / 85	123 ms	15308 KiB

necklace

#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

const int maxn = 3030;

string a,b;
int n, m, mod, pw[maxn];

void solve() {
    cin >> a >> b;
    n = a.size();
    m = b.size();

    mod = 1e9+7;
    pw[0] = 1;
    pw[1] = 1e4+9;
    for(int i = 2; i < max(n,m); i++) {
        pw[i] = pw[i-1]*pw[1]%mod;
    }

    map<int,vector<int>> sta,eda;
    int ansa, ansb, ans = 0;
    for(int i = 0; i < n; i++) {
        int cur = 0;
        for(int j = i; j < n; j++) {
            cur+= (a[j])*pw[j-i]; cur%= mod;
            // It exist one cur that starts in 
            sta[cur].pb(i);
            eda[cur].pb(j);
            // cout << " " << i << " " << j << " " << cur << endl;
        }
    }
    for(int i = 0; i < m; i++) {
        int cur = 0;
        for(int j = i; j < m; j++) {
            cur+= (b[j])*pw[j-i]; cur%= mod;
            //comecando em i
            // if(eda.count(cur)) {
            //     if(j-i+1 > ans) {
            //         ans = j-i+1;
            //         ansa = eda[cur][0]-j+i;
            //         ansb = i;
            //     }
            // }
            if(sta.count(cur)) {
                if(j-i+1 > ans) {
                    ans = j-i+1;
                    ansa = sta[cur][0];
                    ansb = i;
                }
            }
        }
    }

    reverse(all(b));
    for(int i = 0; i < m; i++) {
        int cur = 0;
        for(int j = i; j < m; j++) {
            cur+= (b[j])*pw[j-i]; cur%= mod;
            //comecando em i
            // if(eda.count(cur)) {
            //     if(j-i+1 > ans) {
            //         ans = j-i+1;
            //         ansa = eda[cur][0]-j+i;
            //         ansb = i;
            //         cout << i << " " << j << " " << cur << endl;
            //     }
            // }
            if(sta.count(cur)) {
                if(j-i+1 > ans) {
                    ans = j-i+1;
                    ansa = sta[cur][0];
                    ansb = m-j-1;
                    // cout << i << " " << j << " " << cur << endl;

                }
            }
        }
    }



    cout << ans << endl;
    cout << ansa << " " << ansb << endl;
}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);

    // freopen("in.in", "r", stdin);
    // freopen("out.out", "w", stdout);
    int tt = 1;
    // cin >> tt;
    while(tt--) {
        solve();
    }

}

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