Submission #672187

#	Time	Username	Problem	Language	Result	Execution time	Memory
672187		ReLice	Bootfall (IZhO17_bootfall)	C++14	100 / 100	235 ms	5752 KiB

bootfall

#include<bits/stdc++.h>
using namespace std;
#define endl "\n"
#define ll long long
#define ld long double
#define int long long
#define pb push_back
#define sz size()
#define fr first
#define sc second
void start(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
const ll N=1e5+1;
const ll inf=1e9+7;
ll dp[250001],used[250001];
main(){
    start();
    ll n,k,i,j,b,mx=-1;
	cin >> n;
	vector <ll> ans;
	ll sum=0,a[n];
	for (i=0;i<n;i++) {
		cin>>a[i];
		sum+=a[i];
	}
	dp[0]++;
	for(i=0;i<n;i++)
		for(j=sum;j-a[i]>=0;j--)
			dp[j]+=dp[j-a[i]];


	if(!dp[sum/2] || sum%2) {
		cout<<0;
		exit(0);
	}
	for (i=0;i<n;i++) {
		ll cur=sum-a[i];
		for(j=a[i];j<=sum;j++) {
			dp[j]-=dp[j-a[i]];
		}
		for(ll j=0;j<=cur/2;j++){
			if(dp[j])used[cur-j*2]++;
		}
		for(ll j=sum;j>=a[i];j--){
			dp[j]+=dp[j-a[i]];
		}
	}
	for(ll i=0;i<=sum;i++) {
		if(used[i]==n) ans.pb(i);
	}
	cout<<ans.sz<<'\n';
	for (auto i : ans) cout<<i<<' ';
}

Compilation message (stderr)

bootfall.cpp:19:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   19 | main(){
      | ^~~~
bootfall.cpp: In function 'int main()':
bootfall.cpp:21:10: warning: unused variable 'k' [-Wunused-variable]
   21 |     ll n,k,i,j,b,mx=-1;
      |          ^
bootfall.cpp:21:16: warning: unused variable 'b' [-Wunused-variable]
   21 |     ll n,k,i,j,b,mx=-1;
      |                ^
bootfall.cpp:21:18: warning: unused variable 'mx' [-Wunused-variable]
   21 |     ll n,k,i,j,b,mx=-1;
      |                  ^~

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