Submission #449965

#	Time	Username	Problem	Language	Result	Execution time	Memory
449965		BT21tata	Ice Hockey World Championship (CEOI15_bobek)	C++17	0 / 100	161 ms	16756 KiB

bobek

#include<bits/stdc++.h>
// #pragma GCC target ("avx,avx2,fma")
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
typedef long long ll;
typedef long double ld;
#define SPEED ios_base::sync_with_stdio(false); cin.tie(0), cout.tie(0)
#define rall(v) (v).rbegin(),(v).rend()
#define all(v) (v).begin(),(v).end()
#define OK cerr<<"OK"<<endl<<flush
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define F first
#define S second
#define y0 jahdakdh
#define y1 jahsadakdakdh
#define endl '\n'
using namespace std;
const ll MOD=1e9+7;
// mt19937 rng(std::chrono::system_clock::now().time_since_epoch().count());
 
ll n, m, a[45], ans;
vector<int>v1, v2;

ll bs(int x)
{
    ll l=0, r=v2.size()-1, mid;
    while(l<=r)
    {
        mid=(l+r)>>1;
        if(v2[mid]<=x) l=mid+1;
        else r=mid-1;
    }
    return l;
}

int main()
{
    SPEED;
    v1.pb(0);
    v2.pb(0);
    cin>>n>>m;
    for(int i=0; i<n; i++)
        cin>>a[i];
    // [0, n/2);
    for(ll i=0; i<(1<<(n>>1)); i++)
    {
        ll sum=0;
        for(ll j=0; j<(n>>1); j++)
        {
            if(i&(1<<j)) sum+=a[j];
        }
        if(sum<=m) v1.pb(sum);
    }

    // [n/2, n);
    for(ll i=0; i<(1<<(n-(n>>1))); i++)
    {
        ll sum=0;
        for(ll j=0; j<(n-(n>>1)); j++)
        {
            if(i&(1<<j)) sum+=a[j+(n>>1)];
        }
        if(sum<=m) v1.pb(sum);
    }
    sort(all(v2));
    for(int u : v1)
    {
        ans+=bs(m-u);
    }
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10