Language: C++

#include<iostream>  
#include<cstdio>  
#include<cstdlib>  
#include<cstring>  
#include<string.h>  
#include<vector>  
#include<algorithm>  
#define ll __int64  
#define maxn 110000  
using namespace std;  
  
vector<ll>q[2];  
ll x[maxn],y[maxn];  
ll bit[100];  
int n;  
  
ll solve()//我擦。。这个归并太吊了  
{  
    ll ans=0;  
    for(ll i=0;i<62;i++)  
    {  
        ll tot=0;  
        q[0].clear();q[1].clear();  
        for(ll j=1;j<=n;j++)  
            q[(x[j]>>i)&1].push_back(x[j]);  
        for(ll j=0;j<q[0].size();j++)  
            x[++tot]=q[0][j];  
        for(ll j=0;j<q[1].size();j++)  
            x[++tot]=q[1][j];  
        tot=0;  
        q[0].clear();q[1].clear();  
        for(ll j=1;j<=n;j++)  
            q[(y[j]>>i)&1].push_back(y[j]);  
        for(ll j=0;j<q[0].size();j++)  
            y[++tot]=q[0][j];  
        for(ll j=0;j<q[1].size();j++)  
            y[++tot]=q[1][j];  
        ll len1=1,len2=1,len3=1;  
        ll limit1=1ll<<i;  
        ll limit2=1ll<<(i+1);  
        ll all=(1ll<<(i+1))-1;///这里加1LL  
//        cout<<all<<" all"<<endl;  
        ll sum=0;  
//        for(int i=1;i<=tot;i++) cout<<x[i]<<" ";  
//        cout<<endl;  
//        for(int i=1;i<=tot;i++) cout<<(x[i]&all)<<" ";  
//        cout<<endl;  
//        for(int i=1;i<=tot;i++) cout<<y[i]<<" ";  
//        cout<<endl;  
        for(ll i=n;i>=1;i--)  
        {  
            while((((x[i]&all)+(y[len1]&all))<limit1) && (len1<=n)) len1++;//这里多加几个（）  
            while((((x[i]&all)+(y[len2]&all))<limit2) && (len2<=n)) len2++;  
            while(((x[i]&all)+(y[len3]&all)<limit1+limit2) && (len3<=n)) len3++;//cout<<(x[i]&all)<<" "<<(y[len3]&all)<<" "<<len3<<" "<<y[len3]<<" "<<(limit1+limit2)<<endl;  
            sum+=n-(len1-1-len2+1+len3-1);  
//            cout<<len1<<" "<<len2<<" "<<len3<<endl;  
//            cout<<n-(len1-1-len2+1+len3-1)<<endl;  
        }  
//        cout<<sum<<" sum   "<<i<<endl;  
        if(sum&1) ans+=bit[i];  
    }  
    return ans;  
}  
  
int main()  
{  
//    freopen("1003.txt","r",stdin);  
    int cas;  
    scanf("%I64d",&cas);  
    bit[0]=1;  
    for(ll i=1;i<=61;i++)  
    bit[i]=bit[i-1]*2;  
    for(ll ca=1;ca<=cas;ca++)  
    {  
        scanf("%I64d",&n);  
        for(ll i=1;i<=n;i++)  
            scanf("%I64d",&x[i]);  
        for(ll i=1;i<=n;i++)  
            scanf("%I64d",&y[i]);  
//        cout<<solve()<<endl;  
       printf("Case #%I64d: %I64d\n",ca,solve()) ;  
    }  
}  

Compiler output:
a.cc:8:12: error: '__int64' was not declared in this scope; did you mean '__int64_t'?
    8 | #define ll __int64
      |            ^~~~~~~
a.cc:12:8: note: in expansion of macro 'll'
   12 | vector<ll>q[2];
      |        ^~
a.cc:12:10: error: template argument 1 is invalid
   12 | vector<ll>q[2];
      |          ^
a.cc:12:10: error: template argument 2 is invalid
a.cc:8:12: error: '__int64' does not name a type; did you mean '__int64_t'?
    8 | #define ll __int64
      |            ^~~~~~~
a.cc:13:1: note: in expansion of macro 'll'
   13 | ll x[maxn],y[maxn];
      | ^~
a.cc:8:12: error: '__int64' does not name a type; did you mean '__int64_t'?
    8 | #define ll __int64
      |            ^~~~~~~
a.cc:14:1: note: in expansion of macro 'll'
   14 | ll bit[100];
      | ^~
a.cc:8:12: error: '__int64' does not name a type; did you mean '__int64_t'?
    8 | #define ll __int64
      |            ^~~~~~~
a.cc:17:1: note: in expansion of macro 'll'
   17 | ll solve()//我擦。。这个归并太吊了
      | ^~
a.cc: In function 'int main()':
a.cc:70:5: error: 'bit' was not declared in this scope
   70 |     bit[0]=1;
      |     ^~~
a.cc:8:12: error: '__int64' was not declared in this scope; did you mean '__int64_t'?
    8 | #define ll __int64
      |            ^~~~~~~
a.cc:71:9: note: in expansion of macro 'll'
   71 |     for(ll i=1;i<=61;i++)
      |         ^~
a.cc:71:16: error: 'i' was not declared in this scope
   71 |     for(ll i=1;i<=61;i++)
      |                ^
a.cc:8:12: error: '__int64' was not declared in this scope; did you mean '__int64_t'?
    8 | #define ll __int64
      |            ^~~~~~~
a.cc:73:9: note: in expansion of macro 'll'
   73 |     for(ll ca=1;ca<=cas;ca++)
      |         ^~
a.cc:73:17: error: 'ca' was not declared in this scope; did you mean 'cas'?
   73 |     for(ll ca=1;ca<=cas;ca++)
      |                 ^~
      |                 cas
a.cc:76:16: error: expected ';' before 'i'
   76 |         for(ll i=1;i<=n;i++)
      |                ^
a.cc:76:20: error: 'i' was not declared in this scope
   76 |         for(ll i=1;i<=n;i++)
      |                    ^
a.cc:77:28: error: 'x' was not declared in this scope
   77 |             scanf("%I64d",&x[i]);
      |                            ^
a.cc:78:16: error: expected ';' before 'i'
   78 |         for(ll i=1;i<=n;i++)
      |                ^
a.cc:78:20: error: 'i' was not declared in this scope
   78 |         for(ll i=1;i<=n;i++)
      |                    ^
a.cc:79:28: error: 'y' was not declared in this scope
   79 |             scanf("%I64d",&y[i]);
      |                            ^
a.cc:81:41: error: 'solve' was not declared in this scope
   81 |        printf("Case #%I64d: %I64d\n",ca,solve()) ;
      |                                         ^~~~~