Submission #40517

#	Time	Username	Problem	Language	Result	Execution time	Memory
40517		Pajaraja	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	618 ms	9044 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
long long a[40],c[2000000];
long long binarna(int l,int r,long long val)
{
	if(l==r) return l;
	int s=(l+r)/2;
	if(c[s]>val) return binarna(l,s,val);
	return binarna(s+1,r,val);
}
int main()
{
	int n;
	long long m,sol=0;
	scanf("%d %lld",&n,&m);
	for(int i=0;i<n;i++) scanf("%lld",&a[i]);
	int p=n/2;
	for(int i=0;i<(1<<p);i++)
	{
		int ma=i;
		long long pr=0;
		for(int j=0;j<p;j++)
		{
			if(ma%2==0) pr+=a[j];
			ma/=2;
		}
		c[i]=pr;
	}
	c[1<<p]=2000000000000000000LL;
	sort(c,c+(1<<p)+1);
	int q=n-p;
	for(int i=0;i<(1<<q);i++)
	{
		int ma=i;
		long long pr=0;
		for(int j=0;j<q;j++)
		{
			if(ma%2==0) pr+=a[p+j];
			ma/=2;
		}
		sol+=binarna(0,(1<<p),m-pr);
	}
	printf("%lld",sol);
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:15:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %lld",&n,&m);
                        ^
bobek.cpp:16:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<n;i++) scanf("%lld",&a[i]);
                                          ^

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10