Submission #77124

#	Time	Username	Problem	Language	Result	Execution time	Memory
77124		zetapi	Bootfall (IZhO17_bootfall)	C++14	100 / 100	754 ms	3088 KiB

bootfall

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

#define pb  push_back
#define mp  make_pair
#define ll  int
#define int int
#define itr iterator

typedef pair<ll,ll> pii;

const ll MAX=3e5+9;
const ll LIM=3e5;
const ll mod=1e9+7;

bitset<500*500+9> bs;

set<ll> candidate;

ll N,sum,arr[500*500+9],dp[500*500+9];

void add(ll X)
{
	sum+=X;
	for(int A=500*500;A>=X;A--)
	{
		dp[A]+=dp[A-X];
		if(dp[A]>=mod)
			dp[A]-=mod;
	}
	return ;
}

void remove(ll X)
{
	sum-=X;
	for(int A=X;A<=500*500;A++)
	{
		dp[A]-=dp[A-X];
		if(dp[A]<0)
			dp[A]+=mod;
	}
	return ;
}

signed main()
{
	scanf("%d",&N);
	dp[0]=1;
	for(int A=1;A<=N;A++)
	{
		scanf("%d",&arr[A]);
		add(arr[A]);
	}
	if(sum%2 or (!dp[sum/2]))
		return cout<<0,0;
	for(int A=1;A<=sum;A++)
		bs[A]=1;
	int mn=sum;
	for(int A=1;A<=N;A++)
	{
		remove(arr[A]);
		mn=min(mn,sum);
		for(int B=1;B<=sum;B++)
		{
			if((sum+B)%2 or (!dp[(sum+B)/2]))
				bs[B]=0;
		}
		add(arr[A]);
	}
	vector<int> res;
	for(int A=1;A<=mn;A++)
		if(bs[A])
			res.pb(A);
	cout<<res.size()<<"\n";
	for(auto A:res)
		cout<<A<<" ";
	return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&N);
  ~~~~~^~~~~~~~~
bootfall.cpp:52:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&arr[A]);
   ~~~~~^~~~~~~~~~~~~~

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