Submission #365723

#	Time	Username	Problem	Language	Result	Execution time	Memory
365723		kostia244	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	503 ms	8692 KiB

bobek

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2")
#include<bits/stdc++.h>
#define all(x) begin(x), end(x)
using namespace std;
using ll = long long;
int n;
ll w, a[44];
int main() {
	cin.tie(0)->sync_with_stdio(0);
	//multitest([&](){});
	cin >> n >> w;
	vector<ll> cn;
	for(int i = 0; i < n; i++) cin >> a[i];
	int c = n/2;
	int b = n - c;
	for(int i = 0; i < 1<<c; i++) {
		ll cur = 0;
		for(int j = 0; j < c; j++) if((i>>j)&1) cur += a[j];
		cn.push_back(cur);
	}
	ll ans = 0;
	sort(all(cn));
	for(int i = 0; i < 1<<b; i++) {
		ll cur = 0;
		for(int j = 0; j < b; j++) if((i>>j)&1) cur += a[c+j];
		ans += upper_bound(all(cn), w-cur)-cn.begin();
	}
	cout << ans << '\n';
}

• 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