Submission #260068

#	Time	Username	Problem	Language	Result	Execution time	Memory
260068		arnold518	Vim (BOI13_vim)	C++14	13.89 / 100	21 ms	4480 KiB

vim

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1000;

int N;
char A[MAXN+10];
int dp[MAXN+10][MAXN+10];
vector<int> V[20];

int solve(int now, int pos)
{
	int &ret=dp[now][pos];
	if(ret!=-1) return ret;
	ret=987654321;

	for(int i=0; i<10; i++)
	{
		if(i==4) continue;
		auto it=upper_bound(V[i].begin(), V[i].end(), now);
		if(it==V[i].end()) continue;
		ret=min(ret, solve(*it, pos)+2);
	}
	if(now>pos)
	{
		int p=now-pos+lower_bound(V[4].begin(), V[4].end(), now)-lower_bound(V[4].begin(), V[4].end(), pos);
		auto jt=upper_bound(V[4].begin(), V[4].end(), now);
		if(jt==V[4].end()) ret=min(ret, p);
		else
		{
			for(int i=0; i<10; i++)
			{
				if(i==4) continue;
				auto it=upper_bound(V[i].begin(), V[i].end(), pos);
				if(it==V[i].end()) continue;
				ret=min(ret, solve(*it, *jt)+p+2);
			}
		}
	}
	//printf("%d %d : %d\n", now, pos, ret);
	return ret;
}

int main()
{
	scanf("%d", &N);
	scanf(" %s", A+1);

	for(int i=1; i<=N; i++) V[A[i]-'a'].push_back(i);

	if(V[4].empty()) return !printf("0\n");
	memset(dp, -1, sizeof(dp));
	printf("%d\n", solve(1, V[4].front()));
}

Compilation message (stderr)

vim.cpp: In function 'int main()':
vim.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ~~~~~^~~~~~~~~~
vim.cpp:51:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %s", A+1);
  ~~~~~^~~~~~~~~~~~

• Subtask 1: 13.88888888888889 / 50
• Subtask 2: 0 / 10
• Subtask 3: 0 / 40