2023河南萌新联赛第（五）场 L 异或与

#include<bits/stdc++.h>
#define LL long long
using namespace std;
const int M=1e5+7;

int n,cnt;
LL a[M];
map<LL,int> mp;
LL check(LL x){
	LL ret=(x&1)^0;
	for(LL bit=1;bit<=63;bit++){
		LL u1=(x&(1ll<<(bit-1)))?1:0;
		LL u2=(ret&(1ll<<(bit-1)))?1:0;
		LL v1=(x&(1ll<<bit))?1:0;
		ret=ret+(((u1&u2)^v1)<<bit);
	}
	return ret;
}
int main(){
	ios::sync_with_stdio(false);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<=n;i++){
		LL produce=check(a[i]);
	    if(mp[produce]){
	    	cout<<i<<" "<<mp[produce]<<"\n";
	    	return 0;
	    }
	    mp[a[i]]=i;
	}
	cout<<"-1"<<"\n";
}