Submission #257077

#	Time	Username	Problem	Language	Result	Execution time	Memory
257077		zoooma13	Necklace (Subtask 1-3) (BOI19_necklace1)	C++14	17 / 85	302 ms	36088 KiB

necklace

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

#define MAX_N 3003

int n ,m;
string s ,t;

int com[MAX_N][MAX_N];
int go(int i ,int j){
    if(i == n || j == m)
        return 0;
    int&ret = com[i][j];
    if(~ret)
        return ret;
    go(i+1 ,j);
    go(i ,j+1);
    if(s[i] == t[j])
        return ret = 1 + go(i+1 ,j+1);
    return ret = 0;
}

int main()
{
    cin >> s >> t; n = s.size() ,m = t.size();
    memset(com ,-1 ,sizeof com);
    go(0 ,0);
    pair<int ,pair <int ,int>> ans;
    for(int i=0; i<n; i++)
    for(int j=0; j<m; j++)
        ans = max(ans ,make_pair(com[i][j] ,make_pair(i ,j)));
    reverse(t.begin() ,t.end());
    memset(com ,-1 ,sizeof com);
    go(0 ,0);
    for(int i=0; i<n; i++)
    for(int j=0; j<m; j++)
        ans = max(ans ,make_pair(com[i][j] ,make_pair(i ,m-j-com[i][j])));
    cout << ans.first << endl;
    cout << ans.second.first << ' ' << ans.second.second << endl;
}

• Subtask 1: 5 / 25
• Subtask 2: 4 / 20
• Subtask 3: 8 / 40