Submission #135533

#	Time	Username	Problem	Language	Result	Execution time	Memory
135533		random0029	Aliens (IOI16_aliens)	C++14	25 / 100	171 ms	12668 KiB

aliens

// ItnoE
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 505, MXM = 1e6 + 10;
int n, m, A[N], B[N], MN[MXM];
ll dp[N][N];
inline ll SQR(ll a) {return (a * a);}
int64_t take_photos(int q, int mm, int k, vector < int > RG, vector < int > CG)
{
	m = mm;
	memset(MN, 63, sizeof(MN));
	for (int i = 0; i < q; i ++)
	{
		if (RG[i] > CG[i])
			swap(RG[i], CG[i]);
		MN[CG[i]] = min(MN[CG[i]], RG[i]);
	}
	for (int i = 0; i < m; i ++)
		if (MN[i] <= i)
		{
			int b = i, a = i - MN[i] + 1;
			while (n && B[n] - A[n] >= b - a)
				n --;
			n ++; B[n] = b; A[n] = a;
		}
	memset(dp, 63, sizeof(dp));
	dp[0][0] = 0;
	for (int j = 1; j <= k; j ++)
	{
		for (int i = 1; i <= n; i ++)
		{
			dp[j][i] = dp[j - 1][i];
			for (int h = 1; h <= i; h ++)
			{
				ll vl = dp[j - 1][h - 1];
				vl += SQR(B[i] - B[h] + A[h]);
				if (h > 1 && B[h - 1] > B[h] - A[h])
					vl -= SQR(B[h - 1] - (B[h] - A[h]));
				dp[j][i] = min(dp[j][i], vl);
			}
		}
	}
	return (dp[k][n]);
}
/*int main()
{
	int q = 2;
	int mm = 6;
	int k = 2;
	vector < int > _R = {1, 4};
	vector < int > _C = {4, 1};
	ll Res = take_photos(q, mm, k, _R, _C);
	cout << Res << endl;
}*/

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40