Submission #533296

#	Time	Username	Problem	Language	Result	Execution time	Memory
533296		ddy888	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	509 ms	16708 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define mp make_pair
typedef pair<int,int> pi;

int N;
ll M,A1[1<<20],A2[1<<20],v1[1<<20],v2[1<<20];

int main() {
	scanf("%d%lld",&N,&M);
	int t = N/2;
	N -= t;
	for (int i = 0; i < N; i++) cin >> A1[i];
	for (int i = 0; i < t; i++) cin >> A2[i];
	for (int i = 0; i < (1<<N); i++) {
		for (int j = 0; j < N; j++) {
			if (i&(1<<j)) v1[i] += A1[j];
		}
	}
	for (int i = 0; i < (1<<t); i++) {
		for (int j = 0; j < t; j++) {
			if (i&(1<<j)) v2[i] += A2[j];
		}
	}
	sort(v2,v2+(1<<t));
	ll ans = 0;
	for (int i = 0; i < (1<<N); i++) {
		ll tmp = M- v1[i];
		ans += upper_bound(v2,v2+(1<<t),tmp)-v2;
	}
	printf("%lld",ans);
	return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%d%lld",&N,&M);
      |  ~~~~~^~~~~~~~~~~~~~~~

• 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