Submission #63774

#	Time	Username	Problem	Language	Result	Execution time	Memory
63774		khohko	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	469 ms	17492 KiB

bobek

#include<bits/stdc++.h>
//#pragma GCC optimize("O3")
using namespace std;
#define ll long long
#define pb push_back
#define fr first
#define sc second
#define ARRS ((ll)(2e6+500))
#define MAX ((ll)(1e6+100))
#define MOD ((ll)1e6+7)
#define mi(a,b) a=min((a),(b))

ll n,m,k,p,l,r,q;


ll a[ARRS];
ll b[ARRS];
ll s[ARRS];
ll es[ARRS];

int main(){
	#ifdef KHOKHO
			freopen("in.in","r",stdin);
			freopen("out.out","w",stdout);
	#endif
	ios::sync_with_stdio(0);
	ll S;
	cin>>n>>S;
	ll m=n/2;
	n=n-m;
	for(int i=0; i<n; i++)cin>>a[i];
	for(int i=0; i<m; i++)cin>>b[i];
	for(int i=0; i<(1<<n); i++)
		for(int t=0; t<n; t++)
			if((i>>t)&1)s[i]+=a[t];
	for(int i=0; i<(1<<m); i++)
		for(int t=0; t<m; t++)
			if((i>>t)&1)es[i]+=b[t];
	sort(s,s+(1<<n));
	sort(es,es+(1<<m));
	ll pas=0;
	for(int i=0; i<(1<<n); i++){
		pas+=upper_bound(es,es+(1<<m),S-s[i])-es;
	}
	cout<<pas;

}

• 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