Submission #378388

#	Time	Username	Problem	Language	Result	Execution time	Memory
378388		YJU	Vim (BOI13_vim)	C++14	12.50 / 100	7 ms	5044 KiB

vim

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector,Ofast")
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
const ll N=5e2+5;
const ll INF=(1LL<<30);
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define X first
#define Y second
#define pb push_back
#define mp make_pair
#define lwb lower_bound

ll nxt[N][12],suffix_sum[N],dp[N][N];
string s;
vector<ll> loc;
ll n,m;

ll f(ll have,ll id){
    if(have==m)return 0;
    if(dp[have][id]!=-1)return dp[have][id];
    //cout<<have<<" "<<id<<"\n";
	dp[have][id]=INF;
    REP(j,10){
		if(j=='e'-'a'||nxt[id+1][j]==n)continue;
		ll to=nxt[id+1][j];
		if(to>loc[have]){
			ll nhave=lwb(loc.begin(),loc.end(),to)-loc.begin();
			dp[have][id]=min(dp[have][id],2+(to-loc[have])+f(nhave,loc[have]));
		}else{
			dp[have][id]=min(dp[have][id],f(have,to)+2);
		}
    }
    return dp[have][id];
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	memset(dp,-1,sizeof(dp));
	cin>>n>>s;
	REP(j,10)nxt[n][10]=n;
	for(int i=n-1;i>=0;i--){
		REP(j,10)nxt[i][j]=nxt[i+1][j];
        nxt[i][s[i]-'a']=i;
        if(s[i]=='e')loc.pb(i);
	}
	reverse(loc.begin(),loc.end());
	m=loc.size();
	cout<<f(0,0)+m<<"\n";
	//REP(i,m)REP(j,n)cout<<i<<" "<<j<<" "<<dp[i][j]<<"\n";
	return 0;
}

• Subtask 1: 12.5 / 50
• Subtask 2: 0 / 10
• Subtask 3: 0 / 40