Submission #362250

#	Time	Username	Problem	Language	Result	Execution time	Memory
362250		lukameladze	XOR Sum (info1cup17_xorsum)	C++14	45 / 100	1692 ms	23916 KiB

xorsum

# include <bits/stdc++.h>
using namespace std;
const int N=1e6+5;
long long le,ri,mid,lee,rii;
long long a[N],b[N],c[N],mp[35],ans,n,answ;
int go1(int le, int ri, int val,int val1) {
     ans=-1;
     while (le<=ri) {
           mid=(le+ri)/2;
          if (val+c[mid]>=val1) {
               ans=mid;
               ri=mid-1;
          }
          else le=mid+1;
     }
     return ans;
}
int go2(int le, int ri, int val, int val1) {
     ans=-1;
     while (le<=ri) {
          mid=(le+ri)/2;
          if (val+c[mid]<val1) {
               ans=mid;
               le=mid+1;
          }
          else ri=mid-1;  
     }
     return ans;
}
int main() {
     std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
     cin>>n;
     for (int i=1; i<=n; i++) {
          cin>>a[i];
     }
     for (int i=0; i<=30; i++) {
          for (int j=1; j<=n; j++) {
               b[j]+=a[j]&(1LL<<i);
               c[j]=b[j];
          }
          sort(c+1, c+n+1);
          for (int j=1; j<=n; j++) {
               le=j+1;
               ri=n;
               lee=go1(j+1,n,c[j],(1LL<<i));
               le=j+1;
               ri=n;
               rii=go2(j+1, n, c[j], (1LL<<(i+1)));
               if (rii!=-1 && lee!=-1)
               mp[i]+=rii-lee+1;
               lee=go1(j+1, n, c[j], (1LL<<(i+1))+(1LL<<i));
               rii=n;
               if (rii!=-1 && lee!=-1)
               mp[i]+=rii-lee+1;
          }
     }
     for (int i=0; i<=30; i++) {
         // cout<<mp[i]<<" ";
          if (mp[i]%2) answ+=(1LL<<i);
     }
     for (int i=1; i<=n; i++) {
          answ^=(2*a[i]);
     }
     cout<<answ<<endl;
}

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