Submission #879432

#	Time	Username	Problem	Language	Result	Execution time	Memory
879432		KN200711	Ice Hockey World Championship (CEOI15_bobek)	C++14	50 / 100	417 ms	21664 KiB

bobek

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

int main() {
	int N;
	ll K;
	scanf("%d %lld", &N, &K);
	vector<int> arr(N);
	for(int i=0;i<N;i++) {
		scanf("%d", &arr[i]);
	}
	vector<ll> A, B;
	A.clear();
	B.clear();
	int G = N / 2;
	for(int i=0;i<(1 << G);i++) {
		ll as = 0ll;
		for(int k=0;k<G;k++) {
			if(i&(1 << k)) as += arr[k];
		}
		A.push_back(as);
	}
	for(int i=0;i<(1 << (N - G));i++) {
		ll as = 0ll;
		for(int k=0;k<(N - G);k++) {
			if(i&(1 << k)) as += arr[k + G];
		}
		B.push_back(as);
	}
	sort(B.begin(), B.end());
	ll ans = 0ll;
	for(int i=0;i<A.size();i++) {
		ans += upper_bound(B.begin(), B.end(), K - A[i]) - B.begin();
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:33:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |  for(int i=0;i<A.size();i++) {
      |              ~^~~~~~~~~
bobek.cpp:8:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |  scanf("%d %lld", &N, &K);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~
bobek.cpp:11:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |   scanf("%d", &arr[i]);
      |   ~~~~~^~~~~~~~~~~~~~~

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