Submission #137475

#	Time	Username	Problem	Language	Result	Execution time	Memory
137475		ahmedie404	Cover (COCI18_cover)	C++14	120 / 120	14 ms	376 KiB

cover

#include <bits/stdc++.h>

#define ff first
#define ss second

using namespace std;

const int maxn = 5e3+10;
const long long inf = 2e18+10;

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

int n;
int prox[maxn];

ll dp[maxn];

pii pt[maxn];

int main(void)
{
	scanf("%d", &n);

	for (int i = 1; i <= n; i++)
	{
		scanf("%d %d", &pt[i].ff, &pt[i].ss);

		pt[i].ff = abs(pt[i].ff);
		pt[i].ss = abs(pt[i].ss);
	}

	sort(pt+1, pt+n+1);

	for (int i = 1; i <= n; i++)
	{
		for (int j = i-1; j >= 1; j--)
		{
			if (pt[j].ss > pt[i].ss)
			{
				prox[i] = j;
				break;
			}
		}
	}

	for (int i = 1; i <= n; i++)
		dp[i] = inf;

	for (int i = 1; i <= n; i++)
	{
		int at = i;

		while (at != 0)
		{
			dp[i] = min(dp[i], 4ll*pt[i].ff*pt[at].ss + dp[prox[at]]);
			at = prox[at];
		}
	}

	printf("%lld\n", dp[n]);
}

Compilation message (stderr)

cover.cpp: In function 'int main()':
cover.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
cover.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &pt[i].ff, &pt[i].ss);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 120 / 120