Submission #250744

#	Time	Username	Problem	Language	Result	Execution time	Memory
250744		WhaleVomit	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	564 ms	20872 KiB

bobek

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

#define f first
#define s second
#define pb push_back
#define mp make_pair
#define all(v) v.begin(), v.end()
#define sz(v) (int)v.size()

#define MOO(i, a, b) for(int i=a; i<b; i++)
#define M00(i, a) for(int i=0; i<a; i++)
#define MOOd(i,a,b) for(int i = (b)-1; i >= a; i--)
#define M00d(i,a) for(int i = (a)-1; i>=0; i--)

#define FAST ios::sync_with_stdio(0); cin.tie(0);
#define finish(x) return cout << x << '\n', 0;
#define dbg(x) cerr << ">>> " << #x << " = " << x << "\n";
#define _ << " _ " <<

template<class T> bool ckmin(T& a, const T& b) {return b < a ? a = b, 1 : 0;}
template<class T> bool ckmax(T& a, const T& b) {return a < b ? a = b, 1 : 0;}

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int,int> pi;
typedef pair<ld,ld> pd;
typedef complex<ld> cd;

const int MAX_N = 44;
int n; ll mx;
ll arr[MAX_N];
vector<ll> cnt1;
vector<ll> cnt2;

int main() { FAST
    cin >> n >> mx;
    M00(i, n) cin >> arr[i];
    M00(i, 1<<(n/2)) {
        ll s = 0;
        M00(j, n/2) if(i & (1<<j)) s += arr[j];
        cnt1.pb(s);
    }
    M00(i, 1<<(n-n/2)) {
        ll s = 0;
        M00(j, n-n/2) if(i & (1<<j)) s += arr[n/2 + j];
        cnt2.pb(s);
    }
    sort(all(cnt2));
    ll res = 0;
    for(ll x: cnt1) {
        ll ub = mx - x;
        int lo = -1;
        int hi = sz(cnt2);
        while(lo+1 != hi) {
            int mid = (lo + hi)/2;
            if(cnt2[mid] <= ub) lo = mid;
            else hi = mid;
        }
        res += lo+1;
    }
    finish(res);
}

• 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