Submission #208156

#	Time	Username	Problem	Language	Result	Execution time	Memory
208156		HeydarBABA	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	221 ms	16888 KiB

bobek

#include<bits/stdc++.h>
using namespace std;

const long long maxn = 40;
const long long maxc = (1 << 20) + 10;

long long A, B;
long long n, m;
long long a[maxn];
long long b[maxn];
long long a2[maxc];
long long b2[maxc];
long long ans;

void in();
void solve();
void out();

int main(){
    in();
    solve();
    out();
}

void in(){
    ios::sync_with_stdio(false);
    cin >> n >> m;
    for(long long i = 0; i < n / 2; i++)
        cin >> a[i + 1];
    A = n / 2;
    for(long long i = n / 2; i < n; i++)
        cin >> b[i - n / 2 + 1];
    B = n - A;
}

void solve(){
    for(long long i = 1; i < (1 << A); i++){
        a2[i] = a2[i - (i & -i)];
        a2[i] += a[__builtin_ctz(i) + 1];
    }
    for(long long i = 1; i < (1 << B); i++){
        b2[i] = b2[i - (i & -i)];
        b2[i] += b[__builtin_ctz(i) + 1];
    }
    sort(a2, a2 + (1 << A));
    sort(b2, b2 + (1 << B));
    A = 1 << A;
    B = 1 << B;
    long long nowb = B - 1;
    for(long long i = 0; i < A; i++){
        while(nowb != -1 && b2[nowb] + a2[i] > m)
            nowb--;
        ans += nowb + 1;
    }
}

void out(){
    cout << ans;
}

• 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