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Ch-sriram/missing-number-xor.cpp

Last active October 28, 2020 22:06
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Missing Number in Array [TC: O(N); SC: O(1)]
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missing-number-xor.cpp
// Problem Link: https://practice.geeksforgeeks.org/problems/missing-number-in-array1416/1
int MissingNumber(vector<int>& ar, int n) {
// Find XOR of all integers from 1 to n
int XORn = 0;
for(int i = 1; i <= n; ++i)
XORn ^= i;
// Find XOR of all integers in ar[]
int XORar = 0;
for(int i = 0; i < (int)ar.size(); ++i)
XORar ^= ar[i];
// Return XOR of XORn and XORar
return XORn ^ XORar;
}
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