Submission #457772

#	Time	Username	Problem	Language	Result	Execution time	Memory
457772		mariowong	Bootfall (IZhO17_bootfall)	C++14	28 / 100	1084 ms	524 KiB

bootfall

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

int ct[250005],n,a[505],sum; 
bool dp[250005],gg[250005],imp;
vector <int> ans;
int main() {
	ios::sync_with_stdio(false); 
	cin >> n;
	for (int i=1;i<=n;i++){
		cin >> a[i];
		sum+=a[i];
	}
	for (int i=0;i<=n;i++){
		for (int j=1;j<=n*500;j++){
			dp[j]=false;
			gg[j]=false;
		}
		dp[0]=true;
		for (int j=1;j<=n;j++){
			if (j != i){
				for (int k=j*500;k>=a[j];k--){
					dp[k]=dp[k]|dp[k-a[j]];
				}	
			}
		}
		if (i == 0){
			if (sum%2 == 1 || !dp[sum/2]) imp=true;
			continue;
		}
		for (int j=0;j<=n*500;j++){
			if (dp[j] && !gg[max(j,sum-j-a[i])-min(j,sum-j-a[i])]){
				ct[max(j,sum-j-a[i])-min(j,sum-j-a[i])]++;
				gg[max(j,sum-j-a[i])-min(j,sum-j-a[i])]=true;
			}
		}
	} 
	for (int i=1;i<=n*500;i++){
		if (ct[i] == n)
		ans.push_back(i);
	}
	if (imp){
		cout << "0\n\n";
		return 0;
	}
	cout << (int)ans.size() << "\n";
	for (int i=0;i<ans.size();i++){
		cout << ans[i] << " ";
	}
	cout << "\n";
	return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:47:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |  for (int i=0;i<ans.size();i++){
      |               ~^~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 15 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35