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Submission #766155

# Submission time Handle Problem Language Result Execution time Memory
766155 2023-06-25T10:50:18 Z Ahmed57 XOR Sum (info1cup17_xorsum) C++17
45 / 100
 1600 ms 24572 KB 
#include <bits/stdc++.h>

using namespace std;

signed main(){
    ios_base::sync_with_stdio(false);cin.tie(0);
    long long n;
    cin>>n;
    long long arr[n];
    for(int i = 0;i<n;i++){
        cin>>arr[i];
    }
    long long all = 0;
    for(int i = 0;i<=8;i++){
        long long frq[(1<<(i+1))] = {0};
        long long cnt = 0;
        for(int j = 0;j<n;j++){
            frq[arr[j]%((1<<(i+1)))]++;
        }
        for(int j = 0;j<(1<<(i+1));j++){
            for(int e = j;e<(1<<(i+1));e++){
                if((j+e)&(1<<i)){
                    if(j==e)cnt+=(frq[j]*frq[e]+frq[j])/2;
                    else cnt+=frq[j]*frq[e];
                }
            }
        }
        if(cnt&1)all+=(1<<i);
    }
    for(long long i = 9;i<30;i++){
        vector<long long> v;
        long long ans = 0;
        for(int j = 0;j<n;j++){
            if((arr[j]+arr[j])&(1LL<<i)){
                ans++;
            }
            v.push_back(arr[j]%(1LL<<(i+1)));
        }
        sort(v.begin(),v.end());
        for(int j = 0;j<n;j++){
            long long l = (1LL<<i) , r = (1LL<<(i+1));
            l-=arr[j] , r-=arr[j];
            l%=(1LL<<(i+1));
            r%=(1LL<<(i+1));
            l+=(1LL<<(i+1));
            r+=(1LL<<(i+1));
            l%=(1LL<<(i+1));
            r%=(1LL<<(i+1));
            if(l<r){
                ans += (lower_bound(v.begin(),v.end(),r)-v.begin())-(lower_bound(v.begin(),v.end(),l)-v.begin());
            }else{
                ans += (lower_bound(v.begin(),v.end(),r)-v.begin()) + (n-(lower_bound(v.begin(),v.end(),l)-v.begin()));
            }
        }
        if(((ans/2)&1))all+=(1LL<<i);
    }
    cout<<all<<endl;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 340 KB Output is correct
2 Correct 17 ms 456 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1656 ms 24572 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1656 ms 24572 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 340 KB Output is correct
2 Correct 17 ms 456 KB Output is correct
3 Correct 612 ms 3832 KB Output is correct
4 Correct 613 ms 3872 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 340 KB Output is correct
2 Correct 17 ms 456 KB Output is correct
3 Execution timed out 1656 ms 24572 KB Time limit exceeded
4 Halted 0 ms 0 KB -