Submission #890180

#	Time	Username	Problem	Language	Result	Execution time	Memory
890180		kim	Kpart (eJOI21_kpart)	C++17	100 / 100	755 ms	864 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define eb emplace_back
const int MX=50000;
int a[1005],qs[1005],dp[MX+5],Q,n,z,i,j,k;
int main(){
	ios::sync_with_stdio(false);cin.tie(0);
	cin>>Q;
	while(Q--){
		cin>>n;
		z=0;
		for(i=1;i<=n;++i){
			cin>>a[i];
			qs[i]=a[i]+qs[i-1];
			if(a[i]>MX) z=1;
		}
		if(z) cout<<0<<endl;
		else{
			for(i=0;i<=MX;++i) dp[i]=0;
			vector<int> ok(n+5,1),ans;
			for(i=1;i<=n;++i){
				for(j=MX-a[i];j>=1;--j) if(dp[j]) dp[j+a[i]]=max(dp[j+a[i]],dp[j]);
				dp[a[i]]=i;
				for(j=1,k=i;j<i;++j,--k){
					if((qs[i]-qs[j-1])&1) ok[k]=0;
					else if(dp[qs[i]-qs[j-1]>>1]<j) ok[k]=0;
				}
			}
			for(i=2;i<=n;++i) if(ok[i]) ans.eb(i);
			cout<<ans.size()<<" ";
			for(auto &e:ans) cout<<e<<" ";
			cout<<endl;
		}
	}
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:26:22: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   26 |      else if(dp[qs[i]-qs[j-1]>>1]<j) ok[k]=0;
      |                 ~~~~~^~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 70 / 70