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Submission #120569

# Submission time Handle Problem Language Result Execution time Memory
120569 2019-06-25T02:22:11 Z luciocf Cover (COCI18_cover) C++14
120 / 120
 12 ms 512 KB 
#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];

bool comp(pii a, pii b)
{
	if (a.ff != b.ff) return a.ff < b.ff;
	return a.ss < b.ss;
}

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, comp);

	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

cover.cpp: In function 'int main()':
cover.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
cover.cpp:33:8: 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
120.0 / 120.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 256 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 7 ms 384 KB Output is correct
10 Correct 12 ms 512 KB Output is correct