Submission #1046687

#	Time	Username	Problem	Language	Result	Execution time	Memory
1046687		_rain_	Holding (COCI20_holding)	C++14	55 / 110	28 ms	76932 KiB

holding

#include<bits/stdc++.h>
using i64 = long long;
using namespace std;

const int maxn = 100;
const int maxk = 10000;
int n,L,R,k;
i64 a[maxn+2] , f1[maxn+2][maxk+2] , dp1[maxn+2][maxn+2][maxk+2] , dp2[maxn+2][maxn+2][maxk+2] , f2[maxn+2][maxk+2];

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	#define name "main"
//	freopen(name".inp","r",stdin);
//	freopen(name".out","w+",stdout);

	cin >> n >> L >> R >> k;
	for (int i = 1; i <= n; ++i) cin >> a[i];
	i64 total = 0;
	for (int i = L; i <= R; ++i) total += a[i];
	//... BUILD FOR THE LEFT
		i64 mx = 0;
		for (int i = 1; i < L; ++i)
		{
			for (int j = L; j <= R; ++j) 
			{
				for (int used = 0; used <= k; ++used)
				{
					dp1[i][j][used] = min({dp1[i - 1][j][used] , dp1[i][j - 1][used]});
					if (used - abs(i - j) >= 0)
					{
						dp1[i][j][used] = min(dp1[i][j][used] , dp1[i - 1][j - 1][used - abs(i - j)] + a[i] - a[j]);
					}
					f1[j][used] = min({f1[j - 1][used] , dp1[i][j][used] , f1[j][used]});
					f1[j][used] = min(f1[j][used] , f1[j][used - 1]);
				}
			}
		}
	//... BUILD FOR THE RIGHT
		for (int i = n; i > R; --i)
		{
			for (int j = R; j >= L; --j)
			{
				for (int used = 0; used <= k; ++used)
				{
					dp2[i][j][used] = min(dp2[i+1][j][used] , dp2[i][j+1][used]);
					if (used - abs(i - j) >= 0)
					{
						dp2[i][j][used] = min(dp2[i][j][used] , dp2[i+1][j+1][used - abs(i - j)] + a[j] - a[i]);
					}
					f2[j][used] = min({f2[j + 1][used] , dp2[i][j][used] , f2[j][used] , f2[j][used - 1]});
				}
			}
		}
	i64 answer = total;
	for (int i = L ; i <= R; ++i) for (int used = 0; used <= k; ++used)
			{
				if (i + 1 <= R)
					answer = min(answer , total + f1[i][used] + f2[i + 1][k - used]);
				answer = min(answer , total + f2[i][used]);
				answer = min(answer , total + f1[i][used]);
			}
	cout << answer;
}

Compilation message (stderr)

holding.cpp: In function 'int main()':
holding.cpp:23:7: warning: unused variable 'mx' [-Wunused-variable]
   23 |   i64 mx = 0;
      |       ^~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 0 / 33
• Subtask 4: 0 / 22