Submission #968443

#	Time	Username	Problem	Language	Result	Execution time	Memory
968443		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	233 ms	22732 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll n,m;
ll pr[41];
vector<long long> a={0},b={0};
void solvea(ll curr,ll pos,ll end) {
    if (curr == m) {
        return;
    }
    for (int i=pos+1;i<end;i++) {
        if (curr+pr[i] <= m) {
            a.push_back(curr+pr[i]);
            solvea(curr+pr[i],i,end);
        } else {
            return;
        }
    }
    return;
}
void solveb(ll curr,ll pos,ll end) {
    if (curr == m) {
        return;
    }
    for (int i=pos+1;i<end;i++) {
        if (curr+pr[i] <= m) {
            b.push_back(curr+pr[i]);
            solveb(curr+pr[i],i,end);
        } else {
            return;
        }
    }
    return;
}
int main() {
    cin.tie(0)->sync_with_stdio(false);
    cin >> n >> m;
    for (int i=0;i<n;i++) {
        cin >> pr[i];
        if (pr[i] > m) {
            i--;
            n--;
        }
    }
    sort(pr,pr+n);
    solvea(0,-1,n/2);
    solveb(0,n/2-1,n);
    sort(b.begin(),b.end());
    ll cnt=0;
    n = a.size();
    for (int i=0;i<n;i++) {
        cnt+=upper_bound(b.begin(),b.end(),m-a[i])-b.begin();
    }
    cout << cnt;
    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