Submission #3238777

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Source Code Expand

#include <iostream>
#include <algorithm>

#define N_MAX 200000

long a[N_MAX];
long b[N_MAX];
long b_rem_sort[28][N_MAX];

using namespace std;

int main(){
    int N;
    int xors[N_MAX] = {0};
    cin >> N;
    for(int i = 0; i < N; i++){
        cin >> a[i];
    }
    for(int i = 0; i < N; i++){
        cin >> b[i];
        long pow2 = 1;
        for(int j = 0; j < 28; j++){
            pow2 *= 2;
            b_rem_sort[j][i] = b[i]%pow2;
        }
    }
    for(int j = 0; j < 28; j++){
        sort(b_rem_sort[j], b_rem_sort[j] + N);
    }

    long pow2 = 1;
    for(int j = 0; j < 28; j++){
        pow2 *= 2;
        for(int i = 0; i < N; i++){
            int bound1, bound2, bound3;
            long a_rem;
            a_rem = a[i]%pow2;
            bound1 = lower_bound(b_rem_sort[j], b_rem_sort[j] + N, pow2/2 - a_rem) - b_rem_sort[j];
            bound2 = lower_bound(b_rem_sort[j], b_rem_sort[j] + N, pow2 - a_rem) - b_rem_sort[j];
            bound3 = lower_bound(b_rem_sort[j], b_rem_sort[j] + N, pow2/2 + pow2 - a_rem) - b_rem_sort[j];
            xors[j] = (xors[j] + bound2 - bound1 + N - bound3)%2;
        }
        //cout << '\n';
    }

    long ret = 0;
    pow2 = 1;
    for(int j = 0; j < 28; j++){
        ret += xors[j]*pow2;
        pow2 *= 2;
    }
    cout << ret << '\n';

}

Submission Info

Judge Result