Submission #638798

#	Time	Username	Problem	Language	Result	Execution time	Memory
638798		Ahmed57	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	477 ms	8632 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
int main(){
    long long n,m;
    cin>>n>>m;
    long long arr[n];
    for(int i = 0;i<n;i++){
        cin>>arr[i];
    }
    long long l = n/2;
    vector<long long> v;
    for(int i = 0;i<(1<<l);i++){
        long long s = 0;
        for(int j = 0;j<l;j++){
            if(i&(1<<j)){
                s+=arr[j];
            }
        }
        v.push_back(s);
    }
    sort(v.begin(),v.end());
    long long all = 0;
    for(int i = 0;i<(1<<(n-l));i++){
        long long s= 0;
        for(int j= l;j<n;j++){
            if(i&(1<<(j-l))){
                s+=arr[j];
            }
        }
        if(s<=m)all++;
        long long it = lower_bound(v.begin(),v.end(),(m-s)+1)-v.begin();
        it--;
        if(it>=0)all+=it;
    }
    cout<<all;
	return 0;
}

• 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