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Submission #48677

# Submission time Handle Problem Language Result Execution time Memory
48677 2018-05-17T20:33:21 Z Pajaraja Watching (JOI13_watching) C++17
100 / 100
 999 ms 15484 KB 
#include <bits/stdc++.h>
#define MAXN 2007
using namespace std;
int n,p,q,a[MAXN],dp[MAXN][MAXN];
int provera(int x)
{
	int t1=0,t2=0,t3=1;
	for(int i=1;i<=q;i++) dp[i][0]=1000000000;
	dp[0][0]=0;
	while(t3<=n)
	{
		while(t1<t3 && a[t3]-a[t1+1]>=2*x) t1++;
		while(t2<t3 && a[t3]-a[t2+1]>=x) t2++;
		for(int i=0;i<=q;i++) 
		{
			dp[i][t3]=1000000000;
			if(i>0) dp[i][t3]=min(dp[i-1][t1],dp[i][t3]);
			dp[i][t3]=min(dp[i][t2]+1,dp[i][t3]);
		}
		t3++;
	}
	for(int i=0;i<=q;i++) if(dp[i][n]<=p) return true;
	return false;
}
int binarna(int l,int r)
{
	if(l==r) return l;
	int s=(l+r)/2;
	if(provera(s)) return binarna(l,s);
	return binarna(s+1,r);
}
int main()
{
	scanf("%d%d%d",&n,&p,&q);
	if(p+q>=n) {printf("1"); return 0;}
	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
	sort(a+1,a+n+1);
	a[0]=-1000000000;
	printf("%d",binarna(1,(a[n]-a[1])/2));
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n,&p,&q);
  ~~~~~^~~~~~~~~~~~~~~~~~~
watching.cpp:36:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf("%d",&a[i]);
                        ~~~~~^~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 484 KB Output is correct
3 Correct 2 ms 516 KB Output is correct
4 Correct 2 ms 532 KB Output is correct
5 Correct 2 ms 532 KB Output is correct
6 Correct 2 ms 532 KB Output is correct
7 Correct 2 ms 532 KB Output is correct
8 Correct 3 ms 536 KB Output is correct
9 Correct 2 ms 608 KB Output is correct
10 Correct 3 ms 788 KB Output is correct
11 Correct 2 ms 788 KB Output is correct
12 Correct 3 ms 788 KB Output is correct
13 Correct 2 ms 788 KB Output is correct
14 Correct 2 ms 788 KB Output is correct
15 Correct 2 ms 788 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 788 KB Output is correct
2 Correct 2 ms 788 KB Output is correct
3 Correct 2 ms 788 KB Output is correct
4 Correct 2 ms 788 KB Output is correct
5 Correct 2 ms 788 KB Output is correct
6 Correct 2 ms 788 KB Output is correct
7 Correct 5 ms 788 KB Output is correct
8 Correct 212 ms 6652 KB Output is correct
9 Correct 30 ms 6652 KB Output is correct
10 Correct 17 ms 6652 KB Output is correct
11 Correct 999 ms 15484 KB Output is correct
12 Correct 327 ms 15484 KB Output is correct
13 Correct 5 ms 15484 KB Output is correct
14 Correct 4 ms 15484 KB Output is correct
15 Correct 5 ms 15484 KB Output is correct