Submission #404903

#	Time	Username	Problem	Language	Result	Execution time	Memory
404903		saleh	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	212 ms	16720 KiB

bobek

#include <bits/stdc++.h>

#define int long long
#define lowval(x) (x & (-x))
#define lowind __builtin_ctzll

using namespace std;


const int MAXN = 40 + 3;















int n, m, c[MAXN], dp[(1 << (MAXN >> 1))], pd[(1 << (MAXN >> 1))], ans;



int32_t main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr), cout.tie(nullptr);
	cin >> n >> m;
	for (int i = 0; i < n; i++) cin >> c[i];
	for (int i = 1; i < (1 << (n >> 1)); i++) dp[i] = c[lowind(i)] + dp[i - lowval(i)];
	for (int i = 1; i < (1 << (n - (n >> 1))); i++) pd[i] = c[lowind(i) + (n >> 1)] + pd[i - lowval(i)];
	sort(dp, dp + (1 << (n >> 1)));
	sort(pd, pd + (1 << (n - (n >> 1))));
	for (int i = 0, j = (1 << (n - (n >> 1))) - 1; i < (1 << (n >> 1)); i++) {
		while (~j && pd[j] + dp[i] > m) j--;
		ans += j + 1;
	}
	cout << ans;
	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