Submission #1006115

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006115		AverageAmogusEnjoyer	Necklace (Subtask 1-3) (BOI19_necklace1)	C++17	0 / 85	54 ms	348 KiB

necklace

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template<class T> bool cmin(T &i, T j) { return i > j ? i=j,true:false; }
template<class T> bool cmax(T &i, T j) { return i < j ? i=j,true:false; }

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int main() {
    string s,t;
    cin >> s >> t;
    int n = (int)s.size();
    int ans = 0;
    int a = 0,b = 0;
    auto search = [&](bool sw) {
        for (int i=0;i<n;i++) {
            for (int j=i;j<n;j++) {
                for (int k=i;k>=0;k--) {
                    string r = s.substr(i,j-i+1);
                    string f = s.substr(k,i-k);
                    r += f;
                    auto z = t.find(r);
                    if (z != string::npos && cmax(ans,(int)r.size())) {
                        /*
                        cout << "s = " << s << endl;
                        cout << "t = " << t << endl;
                        cout << "r = " << r << endl;
                        cout << "find = " << t.find(r) << endl;
                        */
                        a = k;
                        b = (sw ? n - (z + (int)r.size() - 1) : z);
                    }
                }
            }
        }
    };
    search(false);
    reverse(t.begin(),t.end());
    search(true);
    assert(ans);
    cout << ans << endl << a << " " << b << endl;
}

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