oj.uz

Submission #763875

# Submission time Handle Problem Language Result Execution time Memory
763875 2023-06-23T01:43:13 Z Trunkty XOR Sum (info1cup17_xorsum) C++14
45 / 100
 1600 ms 28876 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll

int n,ans;
int arr[1000005];

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    for(int i=1;i<=n;i++){
        cin >> arr[i];
    }
    for(int j=0;j<=40;j++){
        int curr=0;
        vector<int> v;
        for(int i=1;i<=n;i++){
            if(arr[i]&(1LL<<j)){
                curr += (n+1);
            }
            v.push_back(arr[i]%(1LL<<j));
        }
        sort(v.begin(),v.end());
        int cnt=0;
        for(int i:v){
            if(i+i>=(1LL<<j) and i+i<(1LL<<(j+1LL))){
                cnt++;
            }
            int low=0,high=v.size();
            while(low!=high){
                int mid = (low+high)/2;
                if(i+v[mid]>=(1LL<<j)){
                    high = mid;
                }
                else{
                    low = mid+1;
                }
            }
            int low2=0,high2=v.size();
            while(low2!=high2){
                int mid2 = (low2+high2)/2;
                if(i+v[mid2]>=(1LL<<(j+1LL))){
                    high2 = mid2;
                }
                else{
                    low2 = mid2+1;
                }
            }
            cnt += low2-low;
        }
        curr += cnt/2LL;
        if(curr%2){
            ans += (1LL<<j);
        }
    }
    cout << ans << "\n";
    return 0;
}

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 336 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1672 ms 28876 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 1672 ms 28876 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 336 KB Output is correct
3 Correct 480 ms 3856 KB Output is correct
4 Correct 474 ms 4040 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 336 KB Output is correct
3 Execution timed out 1672 ms 28876 KB Time limit exceeded
4 Halted 0 ms 0 KB -