Submission #710627

#	Time	Username	Problem	Language	Result	Execution time	Memory
710627		WonderfulWhale	Ice Hockey World Championship (CEOI15_bobek)	C++17	50 / 100	1085 ms	120224 KiB

bobek

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

#define int int64_t
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()

map<int, int> M;
map<int, int> M2;
set<pii> S;

int tab[49];

int32_t main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n, Sum;
	cin >> n >> Sum;
	for(int i=0;i<n;i++) {
		cin >> tab[i];
	}
	int m = n/2;
	if(n==1) {
		if(tab[0]<=Sum) {
			cout << "1\n";
		} else {
			cout << "0\n";
		}
		return 0;
	}
	int m2 = n-m;
	for(int i=0;i<(1<<m);i++) {
		int s = 0;
		for(int j=0;j<m;j++) {
			if(i&(1<<j)) {
				s+=tab[j];
			}
		}
		M[s]++;
	}
	for(int i=0;i<(1<<m2);i++) {
		int s = 0;
		for(int j=m;j<n;j++) {
			if(i&(1<<(j-m))) {
				s+=tab[j];
			}
		}
		M2[s]++;
	}
	int s = 0;
	for(pii x:M2) {
		s += x.nd;
		S.insert({x.st, s});
	}
	int ans = 0;
	for(pii x:M) {
		if(x.st>Sum) continue;
		int val = Sum-x.st;
		auto it = S.upper_bound({val, 1e18});
		if(it==S.begin()) continue;
		it--;
		ans += x.nd*(*it).nd;
	}
	cout << ans << "\n";

}

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