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Submission #359146

# Submission time Handle Problem Language Result Execution time Memory
359146 2021-01-26T11:39:47 Z ogibogi2004 XOR Sum (info1cup17_xorsum) C++14
100 / 100
 1442 ms 17572 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int MAXN=1e6+6;
const int logN=30;
int n;
int a[MAXN],a1[MAXN];
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	cin>>n;
	for(int i=1;i<=n;++i)
	{
		cin>>a[i];
	}
	int ans=0;
	for(int j=0;j<logN;++j)
	{
		int sz=0;
		if(j!=0)
		{
			for(int i=1;i<=n;++i)
			{
				if(!(a[i]&(1<<(j-1))))
				{
					a1[++sz]=a[i];
				}
			}
			for(int i=1;i<=n;++i)
			{
				if(a[i]&(1<<(j-1)))
				{
					a1[++sz]=a[i];
				}
			}
			for(int i=1;i<=n;++i)a[i]=a1[i];
		}
		ll cnt0up=0,cnt1up=0,cnt0down=0,cnt1down=0;
		int p=n;
		ll cnt=0;
		for(int i=1;i<=n;++i)
		{
			if(a[i]&(1<<j))++cnt1up;
			else ++cnt0up;
		}
		for(int i=1;i<=n;++i)
		{
			while(p>0&&a[p]%(1<<j)+a[i]%(1<<j)>=(1<<j))
			{
				if(a[p]&(1<<j))++cnt1down,--cnt1up;
				else ++cnt0down,--cnt0up;
				--p;
			}
			if(a[i]&(1<<j))
			{
				cnt+=cnt0up+cnt1down;
			}
			else
			{
				cnt+=cnt1up+cnt0down;
			}
			if((2*a[i])&(1<<j))++cnt;
		}
		//cout<<j<<" "<<cnt<<endl;
		if((cnt/2)%2==1)
		{
			ans+=(1<<j);
		}
	}
	cout<<ans<<"\n";
return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 396 KB Output is correct
2 Correct 7 ms 364 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 756 ms 8300 KB Output is correct
2 Correct 706 ms 7764 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 756 ms 8300 KB Output is correct
2 Correct 706 ms 7764 KB Output is correct
3 Correct 1036 ms 8172 KB Output is correct
4 Correct 977 ms 8044 KB Output is correct

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 396 KB Output is correct
2 Correct 7 ms 364 KB Output is correct
3 Correct 147 ms 1132 KB Output is correct
4 Correct 145 ms 1260 KB Output is correct

Subtask #5
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 396 KB Output is correct
2 Correct 7 ms 364 KB Output is correct
3 Correct 756 ms 8300 KB Output is correct
4 Correct 706 ms 7764 KB Output is correct
5 Correct 1036 ms 8172 KB Output is correct
6 Correct 977 ms 8044 KB Output is correct
7 Correct 147 ms 1132 KB Output is correct
8 Correct 145 ms 1260 KB Output is correct
9 Correct 1442 ms 8284 KB Output is correct
10 Correct 1412 ms 8300 KB Output is correct
11 Correct 1429 ms 17572 KB Output is correct