Submission #461293

#	Time	Username	Problem	Language	Result	Execution time	Memory
461293		vanic	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	247 ms	20900 KiB

bobek

#include <iostream>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>

using namespace std;

typedef long long ll;

const int maxn=45;

vector < ll > v[2];

int n;
ll m;
ll a[maxn];
ll pref[maxn];
ll sol;
int gran, ind;


void rijesi(int x, ll sum){
//	cout << x << endl;
	if(x==gran){
		v[ind].push_back(sum);
		return;
	}
	rijesi(x+1, sum+a[x]);
	rijesi(x+1, sum);
}

int main(){
	scanf("%d%lld", &n, &m);
	for(int i=0; i<n; i++){
		scanf("%lld", a+i);
		pref[i+1]=pref[i]+a[i];
	}
	gran=n/2;
	ind=0;
	rijesi(0, 0);
	gran=n;
	ind=1;
	rijesi(n/2, 0);
	sort(v[0].begin(), v[0].end());
	sort(v[1].begin(), v[1].end());
	int pos=0;
	for(int i=v[0].size()-1; i>=0; i--){
		while(pos<(int)v[1].size() && v[1][pos]<=m-v[0][i]){
			pos++;
		}
		sol+=pos;
	}
	printf("%lld\n", sol);
	return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  scanf("%d%lld", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
bobek.cpp:36:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |   scanf("%lld", a+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