제출 #1261107

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1261107		ebrambill	Necklace (Subtask 1-3) (BOI19_necklace1)	C++17	45 / 85	76 ms	35652 KiB

necklace

//In the name of GOD

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

#define f first
#define s second

const int maxN=3e3+5;
int n, m, lps[maxN][maxN], tmp[maxN]={-1};
string s, t, ts;
pair<int, pair<int, int>> ans;

void solve(bool rt, bool rs){
	for (int i=m; i>=1; i--){
		for (int j=i, cur=j-1; j<=n+m+1; j++, cur=j-1){
			while(ts[tmp[cur-i+1]+i]!=ts[j] and tmp[cur-i+1]>=0) cur=tmp[cur-i+1]+i-1;
			tmp[j-i+1]=tmp[cur-i+1]+1;
			if(j>m+1) lps[i][j-m-1]=tmp[j-i+1];
		}
		for (int j=1; j<=n; j++){
			int x=lps[i][j]+lps[i+lps[i][j]][j-lps[i][j]];
			if(x>ans.f) ans={x, {(!rt ? i-1 : m-i-x+1) , (!rs ? j-x : n-j)}};
		}
	}
}

int main(){
	cin >>s >>t;
	n=s.size(), m=t.size();
	ts='.'+t+'.'+s;
	solve(false, false);
	reverse(ts.begin()+m+2, ts.end());
	solve(false, true);
	reverse(ts.begin()+1, ts.begin()+m+1);
	solve(true, true);
	reverse(ts.begin()+m+2, ts.end());
	solve(true, false);
	cout <<ans.f <<endl <<ans.s.s <<' ' <<ans.s.f;
}

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