Submission #462017

#	Time	Username	Problem	Language	Result	Execution time	Memory
462017		kingfran1907	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	516 ms	8700 KiB

bobek

#include <bits/stdc++.h>
#define X first
#define Y second

using namespace std;
typedef long long llint;

const int maxn = 2e5+10;
const int base = 31337;
const int mod = 1e9+7;
const int inf = 0x3f3f3f3f;
const int logo = 18;
const int off = 1 << logo;
const int treesiz = off << 1;

int n;
llint m;
llint niz[maxn];
vector< llint > v;

int main() {
	scanf("%d%lld", &n, &m);
	for (int i = 0; i < n; i++)
		scanf("%lld", niz+i);
		
	int hf = n / 2;
	int lim = (1 << hf);
	for (int mask = 0; mask < lim; mask++) {
		llint sum = 0;
		for (int i = 0; i < hf; i++)
			if (mask & (1 << i)) sum += niz[i];	
		v.push_back(sum);
	}
	sort(v.begin(), v.end());
	
	llint sol = 0;
	lim = (1 << (n - hf));
	for (int mask = 0; mask < lim; mask++) {
		llint sum = 0;
		for (int i = 0; i < n - hf; i++) {
			if (mask & (1 << i)) sum += niz[i + n / 2];
		}
		
		int ind = upper_bound(v.begin(), v.end(), m - sum) - v.begin();
		sol += ind;
	}
	printf("%lld\n", sol);
	return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |  scanf("%d%lld", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
bobek.cpp:24:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   scanf("%lld", niz+i);
      |   ~~~~~^~~~~~~~~~~~~~~

• 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