Submission #256404

#	Time	Username	Problem	Language	Result	Execution time	Memory
256404		Saboon	Vim (BOI13_vim)	C++14	55 / 100	670 ms	193160 KiB

vim

#include <bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef long long ll;

const int maxn = 7000 + 10;

int nex[maxn][12];
int dp[maxn][maxn];
int pd[maxn];

int main(){
	ios_base::sync_with_stdio(false);
	int n;
	string s;
	cin >> n >> s;
	for (int i = 0; i < 10; i++){
		int last = -1;
		for (int j = n-1; j >= 0; j--){
			if (last == -1)
				nex[j][i] = j;
			else
				nex[j][i] = last;
			if ((int)(s[j] - 'a') == i and s[j] != 'e')
				last = j;
		}
	}
	vector<int> e;
	for (int i = 0; i < n; i++)
		if (s[i] == 'e')
			e.push_back(i);
	if (e.empty())
		return cout << 0 << endl, 0;
	int m = e.size();
	memset(dp, 63, sizeof dp);
	dp[0][0] = 0;
	for (int i = 0; i < m; i++){
		memset(pd, 63, sizeof pd);
		for (int j = 0; j <= i; j++){
			if (j > 0)
				pd[e[j-1]+1] = dp[i][j];
			else
				pd[0] = dp[i][j];
		}
		for (int j = 0; j < n; j++)
			for (int c = 0; c < 10; c++)
				if (nex[j][c] != j)
					pd[nex[j][c]] = min(pd[nex[j][c]], pd[j] + 2);
		int it = 0;
		for (int idx = 0; idx < n; idx ++){
			if (s[idx] == 'e')
				continue;
			while (it < m and e[it] < idx)
				it ++;
			if (it <= i)
				continue;
			dp[it][i+1] = min(dp[it][i+1], pd[idx] + (idx-e[i]) + (it-i));
		}
	}
	int answer = 4*n;
	for (int i = 1; i <= m; i++)
		answer = min(answer, dp[m][i]);
	cout << answer << endl;
}

• Subtask 1: 50 / 50
• Subtask 2: 5 / 10
• Subtask 3: 0 / 40