Submission #159355

#	Time	Username	Problem	Language	Result	Execution time	Memory
159355		mrtsima22	XOR Sum (info1cup17_xorsum)	C++17	45 / 100	1655 ms	8184 KiB

xorsum

#include <bits/stdc++.h>
using namespace std;
const int M=29;
int n,a[1000004],b[1000004];
int c[39],ans;
void work(int x,int y,int &k,int &K){
	int l=-1,r=-1;
	for(int o=n-1;o>=0;o--){
//		cout<<b[o]<<endl;
		while(l+1<n&&b[l+1]+b[o]<x) l++;
		while(r+1<n&&b[r+1]+b[o]<=y) r++;
		if(o>l&&o<=r) K++;
		if(l<=r)
			k+=(r-l);
//		cout<<l<<" "<<r<<" "<<x<<" "<<y<<" "<<b[o]<<" "<<b[r]<<endl;
	}
}
int main(){
	ios::sync_with_stdio(false);
for(int i=1;i<=M;i++){
	c[i]=(1<<(i+1))-1;
}
cin>>n;
for(int i=0;i<n;i++){
	cin>>a[i];
}
for(int i=1;i<=M;i++){
	for(int j=0;j<n;j++){
		b[j]=c[i]&a[j];
	}
	sort(b,b+n);
	int b1=(1<<(i));
	int b2=((1<<(i+1))-1);
	int B1=b1+(1<<(i+1));
	int B2=((1<<(i+2))-2);
	int k=0,K=0;
	work(b1,b2,k,K);
	work(B1,B2,k,K);
	k-=K;
	k/=2;
	k+=K;
//	cout<<k<<endl;
	if(k&1){
		ans|=(1<<(i));
	}
}
int k=0;
for(int i=0;i<n;i++){
	if(a[i]&1) k++;
}
if((k*(n-k))&1){
	ans++;
}
cout<<ans<<endl;

}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 38 / 38
• Subtask 5: 0 / 23