#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e6;
const ll inf=1e18;
const ll mod=1e9+7;
vector<ll> cc;
ll n;
ll a[maxN],b[maxN];
ll g(ll i,ll j)
{
return i&((1<<(j+1))-1);
}
ll get(ll j)
{
ll cnt=0;
ll sum=0;
for(ll i=1;i<=n;i++)
{
ll x=a[i]>>j&1;
cnt+=x;
cnt%=2;
sum+=(cnt+x*(i));
sum%=2;
}
cnt=0;
ll k=0;
for(int i=cc.size()-1;i>=0;i--)
{
while(k<cc.size()&&g(cc[k],j-1)+g(cc[i],j-1)>=(1<<j)) k++;
ll x=k;
if(g(cc[i],j-1)*2>=(1<<j)) x++;
cnt+=x;
}
cnt/=2;
sum+=cnt;
sum%=2;
return sum;
}
void upd(ll j)
{
vector<ll> x,y;
for(int i=0;i<cc.size();i++)
{
if(cc[i]>>j&1) x.pb(cc[i]);
else y.pb(cc[i]);
}
for(int i=0;i<x.size();i++)
{
cc[i]=x[i];
}
for(int i=x.size();i<x.size()+y.size();i++)
{
cc[i]=y[i-x.size()];
}
}
void solve()
{
cin >> n;
cc.resize(n);
for(int i=1;i<=n;i++) cin >> a[i],cc[i-1]=(a[i]);
ll ans=0;
for(int j=0;j<=29;j++)
{
ans+=get(j)<<j;
upd(j);
}
//cout << cc.size()<<'\n';
//for(auto zz:cc) cout << zz<<' ';
cout << ans;
}
int main()
{
fastio
//freopen(TASKNAME".INP","r",stdin);
//freopen(TASKNAME".OUT","w",stdout);
solve();
}
Compilation message
xorsum.cpp: In function 'll get(ll)':
xorsum.cpp:36:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | while(k<cc.size()&&g(cc[k],j-1)+g(cc[i],j-1)>=(1<<j)) k++;
| ~^~~~~~~~~~
xorsum.cpp: In function 'void upd(ll)':
xorsum.cpp:49:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
49 | for(int i=0;i<cc.size();i++)
| ~^~~~~~~~~~
xorsum.cpp:54:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
54 | for(int i=0;i<x.size();i++)
| ~^~~~~~~~~
xorsum.cpp:58:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
58 | for(int i=x.size();i<x.size()+y.size();i++)
| ~^~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
468 KB |
Output is correct |
2 |
Correct |
4 ms |
468 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
503 ms |
38400 KB |
Output is correct |
2 |
Correct |
480 ms |
34896 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
503 ms |
38400 KB |
Output is correct |
2 |
Correct |
480 ms |
34896 KB |
Output is correct |
3 |
Correct |
587 ms |
41712 KB |
Output is correct |
4 |
Correct |
519 ms |
39108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
468 KB |
Output is correct |
2 |
Correct |
4 ms |
468 KB |
Output is correct |
3 |
Correct |
62 ms |
4752 KB |
Output is correct |
4 |
Correct |
61 ms |
4836 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
468 KB |
Output is correct |
2 |
Correct |
4 ms |
468 KB |
Output is correct |
3 |
Correct |
503 ms |
38400 KB |
Output is correct |
4 |
Correct |
480 ms |
34896 KB |
Output is correct |
5 |
Correct |
587 ms |
41712 KB |
Output is correct |
6 |
Correct |
519 ms |
39108 KB |
Output is correct |
7 |
Correct |
62 ms |
4752 KB |
Output is correct |
8 |
Correct |
61 ms |
4836 KB |
Output is correct |
9 |
Correct |
675 ms |
44172 KB |
Output is correct |
10 |
Correct |
642 ms |
44456 KB |
Output is correct |
11 |
Correct |
633 ms |
44196 KB |
Output is correct |