oj.uz

Submission #12950

# Submission time Handle Problem Language Result Execution time Memory
12950 2015-01-21T12:25:38 Z gs13068 Watching (JOI13_watching) C++
100 / 100
 112 ms 16780 KB 
#include<cstdio>
#include<algorithm>

long long c[2002];
int x[2002];
int y[2002];
int d[2002][2002];

int main()
{
	int l,r,mid;
	int i,j,n,a,b;
	scanf("%d%d%d",&n,&a,&b);
	if(a+b>=n)
	{
		puts("1");
		return 0;
	}
	for(i=1;i<=n;i++)scanf("%lld",&c[i]);
	std::sort(c+1,c+n+1);
	l=1;
	r=(1e9+a+b+b-1)/(a+b+b);
	while(l<r)
	{
		mid=(l+r)/2;
        for(i=1;i<=n;i++)
		{
			x[i]=std::lower_bound(c+i+1,c+n+1,c[i]+mid)-c;
			y[i]=std::lower_bound(c+i+1,c+n+1,c[i]+mid+mid)-c;
		}
		x[n+1]=y[n+1]=n+1;
		for(i=0;i<=n&&i<=a;i++)for(j=0;i+j<=n&&j<=b;j++)d[i][j]=1;
		for(i=0;i<n&&i<=a;i++)for(j=0;i+j<n&&j<=b;j++)
		{
			d[i+1][j]=std::max(d[i+1][j],x[d[i][j]]);
			d[i][j+1]=std::max(d[i][j+1],y[d[i][j]]);
		}
		for(i=0;i<=n&&i<=a;i++)
		{
			for(j=0;i+j<=n&&j<=b;j++)if(d[i][j]>n)break;
			if(i+j<=n&&j<=b)break;
		}
        if(i<=n&&i<=a)r=mid;
        else l=mid+1;
	}
	printf("%d",l);
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 16780 KB Output is correct
2 Correct 0 ms 16780 KB Output is correct
3 Correct 0 ms 16780 KB Output is correct
4 Correct 0 ms 16780 KB Output is correct
5 Correct 0 ms 16780 KB Output is correct
6 Correct 0 ms 16780 KB Output is correct
7 Correct 0 ms 16780 KB Output is correct
8 Correct 0 ms 16780 KB Output is correct
9 Correct 0 ms 16780 KB Output is correct
10 Correct 0 ms 16780 KB Output is correct
11 Correct 0 ms 16780 KB Output is correct
12 Correct 0 ms 16780 KB Output is correct
13 Correct 0 ms 16780 KB Output is correct
14 Correct 0 ms 16780 KB Output is correct
15 Correct 0 ms 16780 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 16780 KB Output is correct
2 Correct 0 ms 16780 KB Output is correct
3 Correct 0 ms 16780 KB Output is correct
4 Correct 0 ms 16780 KB Output is correct
5 Correct 0 ms 16780 KB Output is correct
6 Correct 0 ms 16780 KB Output is correct
7 Correct 4 ms 16780 KB Output is correct
8 Correct 12 ms 16780 KB Output is correct
9 Correct 12 ms 16780 KB Output is correct
10 Correct 24 ms 16780 KB Output is correct
11 Correct 20 ms 16780 KB Output is correct
12 Correct 112 ms 16780 KB Output is correct
13 Correct 4 ms 16780 KB Output is correct
14 Correct 0 ms 16780 KB Output is correct
15 Correct 0 ms 16780 KB Output is correct