Submission #281998

#	Time	Username	Problem	Language	Result	Execution time	Memory
281998		ChrisT	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	253 ms	20944 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
int main () {
	int n; long long m;
	scanf ("%d %lld",&n,&m);
	vector<long long> a(n), sums1, sums2; int ed;
	for (auto &au : a) scanf ("%lld",&au);
	function<void(int,long long,vector<long long>&)> gen = [&] (int ind, long long sum, vector<long long> &sums) {
		if (ind == ed) return (void)sums.push_back(sum);
		gen(ind+1,sum,sums); gen(ind+1,sum+a[ind],sums);
	};
	ed = n/2;
	gen(0,0,sums1);
	ed = n;
	gen(n/2,0,sums2);
	sort(sums1.begin(),sums1.end()); sort(sums2.begin(),sums2.end());
	long long ret = 0; int pp = (int)sums2.size() - 1;
	for (int i = 0; i < (int)sums1.size(); i++) {
		while (~pp && sums1[i] + sums2[pp] > m) --pp;
		ret += pp + 1;
	}
	printf ("%lld\n",ret);
	return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:5:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    5 |  scanf ("%d %lld",&n,&m);
      |  ~~~~~~^~~~~~~~~~~~~~~~~
bobek.cpp:7:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |  for (auto &au : a) scanf ("%lld",&au);
      |                     ~~~~~~^~~~~~~~~~~~

• 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