Submission #170881

#	Time	Username	Problem	Language	Result	Execution time	Memory
170881		socho	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	418 ms	21000 KiB

bobek

#include "bits/stdc++.h"
using namespace std;

int main() {
	
	long long n, m;
	cin >> n >> m;
	
	vector<long long> vc(n);
	for (long long i=0; i<n; i++) cin >> vc[i];
	
	vector<long long> le, ri;
	for (long long i=0; i<n/2; i++) {
		le.push_back(vc[i]);
		// cout << "L " << i << endl;
	}
	for (long long i=n/2; i<n; i++) {
		ri.push_back(vc[i]);
		// cout << "R " << i << endl;
	}
	
	long long ls = le.size(), rs = ri.size();
	vector<long long> les, ris;
	for (long long i=0; i<(1<<ls); i++) {
		long long sm = 0;
		for (long long j=0; j<ls; j++) {
			if (i & (1 << j)) sm += le[j];
		}
		les.push_back(sm);
	}
	for (long long i=0; i<(1<<rs); i++) {
		long long sm = 0;
		for (long long j=0; j<rs; j++) {
			if (i & (1 << j)) sm += ri[j];
		}
		ris.push_back(sm);
	}
	
	sort(les.begin(), les.end());
	sort(ris.begin(), ris.end());
	reverse(ris.begin(), ris.end());
	
	long long valid = 0;
	long long pt = 0;
	
	for (int i=0; i<les.size(); i++) {
		long long mx = m - les[i];
		while (pt < ris.size() && ris[pt] > mx) pt++;
		valid += (ris.size() - pt);
	}
	
	cout << valid << endl;
	
	
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:46:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<les.size(); i++) {
                ~^~~~~~~~~~~
bobek.cpp:48:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (pt < ris.size() && ris[pt] > mx) pt++;
          ~~~^~~~~~~~~~~~

• 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