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답안 #622517

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
622517 2022-08-04T10:53:16 Z dozer Tortoise (CEOI21_tortoise) C++14
0 / 100
 185 ms 524288 KB 
#include <bits/stdc++.h>
using namespace std;
#define sp " "
#define endl "\n"
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define pb push_back
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define pii pair<int, int>
#define st first
#define nd second
#define N 10005
#define modulo 1000000007
#define int long long

int dp[N][N];
vector<int> pg;
int arr[N], n;

int f(int time, int ind)
{
	if (time > 2 * (n - 1) || ind > n) return 0;
	if (arr[ind] == -1) return dp[time][ind] = f(time + 1, ind + 1);
	if (dp[time][ind] != -1) return dp[time][ind];
	auto it = lower_bound(pg.begin(), pg.end(), ind);
	int nxt = modulo, prv = - modulo;
	if (it != pg.end()) nxt = *it;
	if (it != pg.begin())
	{
		it--;
		prv = *it;
	}
	int dist = min(ind - prv, nxt - ind);
	int tmp = time, inc = 0, ans = 0;
	while(tmp <= ind * 2 - 2 && inc < arr[ind])
	{
		if (nxt <= n)
		{
			for (int i = ind + 1; i <= nxt; i++)//for the last candy we buy, we can go to the next pg and come back to a forward shop
			{
				ans = max(ans, f(tmp + nxt - ind + nxt - i, i) + inc + 1);
			}
		}
		
		ans = max(ans, f(tmp + 1, ind + 1) + inc); // we can just continue to the next place without buying more candies
		ans = max(ans, inc + 1);//buy it and finish the process
		tmp += 2 * dist;
		inc++;
	}
	ans = max(ans, f(tmp + 1, ind + 1) + inc);
	ans = max(ans, f(time + 1, ind + 1));
	//cout<<time<<sp<<ind<<sp<<ans<<endl;
	return dp[time][ind] = ans;
}

int32_t main()
{
	fastio();
	memset(dp, -1, sizeof(dp));

	cin>>n;
	int sum = 0;
	for (int i = 1; i <= n; i++)
	{
		cin>>arr[i];
		if (arr[i] == -1) pg.pb(i);
		else sum += arr[i];
	}

	cout<<sum - f(0, 1)<<endl;
	cerr<<"time taken: "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}

Subtask #1
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 185 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 185 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 185 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 185 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 185 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -