Sansa and XOR

Problem Statement :

Sansa has an array. She wants to find the value obtained by XOR-ing the contiguous subarrays, followed by XOR-ing the values thus obtained. Determine this value.


Subarray	Operation	Result
3		None		3
4		None		4
5		None		5
3,4		3 XOR 4		7
4,5		4 XOR 5		1
3,4,5		3 XOR 4 XOR 5	2
Now we take the resultant values and XOR them together:

. Return .

Function Description

Complete the sansaXor function in the editor below.

sansaXor has the following parameter(s):

int arr[n]: an array of integers

int: the result of calculations

Input Format

The first line contains an integer , the number of the test cases.

Each of the next  pairs of lines is as follows:
- The first line of each test case contains an integer , the number of elements in .
- The second line of each test case contains  space-separated integers .

Solution :


                            Solution in C :

In  C :

#include <stdio.h>
#include <stdlib.h> 
#define MOD 1000000007
#define s(k) scanf("%d",&k);
#define sll(k) scanf("%lld",&k);
#define p(k) printf("%d\n",k);
#define pll(k) printf("%lld\n",k);
#define f(i,N) for(i=0;i<N;i++)
#define f1(i,N) for(i=0;i<=N;i++)
#define f2(i,N) for(i=1;i<=N;i++)
typedef long long ll;
int main(){
    int t,n,k,sum,i;
        } else {
    return 0;

                        Solution in C++ :

In  C++  :

#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <limits>
#include <cstring>
#include <string>
using namespace std;

#define pairii pair<int, int>
#define llong long long
#define pb push_back
#define sortall(x) sort((x).begin(), (x).end())
#define INFI  numeric_limits<int>::max()
#define INFLL numeric_limits<llong>::max()
#define INFD  numeric_limits<double>::max()
#define FOR(i,s,n) for (int (i) = (s); (i) < (n); (i)++)
#define FORZ(i,n) FOR((i),0,(n))

void solve() {
  int n;
  int res = 0;
  FORZ(i,n) {
    int x;
    if ((i+1)%2 && (n-i)%2) {
      res ^= x;

int main() {
#ifdef DEBUG
  freopen("in.txt", "r", stdin);
  freopen("out.txt", "w", stdout);
  int t;
  FORZ(i,t) solve();
  return 0;

                        Solution in Java :

In  Java :

import java.util.HashMap;
import java.util.Map;

public class Solution {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(;
		String line = br.readLine();
		int num = Integer.parseInt(line);
		for (int i = 0; i < num; i++) {
			String count = br.readLine();
			String[] ns = br.readLine().split(" ");
			sansaXor(ns, Integer.valueOf(count));

	public static void sansaXor(String[] strs, int count){
		Map<Integer,Integer> map = new HashMap<Integer,Integer>();
		long result = 0;
		for(int i = 0; i < count; i++){
			int numCount = (i + 1)*(count - i);
			int tmp = Integer.valueOf(strs[i]);
				map.put(tmp, numCount+map.get(tmp));
				map.put(tmp, numCount);
		for(int k: map.keySet()){
			int value = map.get(k);
				result = result^k;

                        Solution in Python : 
In  Python3 :

for _ in range(int(input())):
    N = int(input())
    A = tuple(map(int,input().split()))
    X = 0
    for i, x in enumerate(A):
        if ((i+1) * (N-i)) % 2 == 1:
            X ^= x

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