Create Duplicate In Array

Arrays/Duplicate In Array

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+Given a read only array of n + 1 integers between 1 and n, find one number that repeats in linear time using less than O(n) space and traversing the stream sequentially O(1) times.
+
+Sample Input:
+
+[3 4 1 4 1]
+Sample Output:
+
+1
+If there are multiple possible answers ( like in the sample case above ), output any one.
+
+If there is no duplicate, output -1
+
+
+
+
+SOLUTION:
+
+int Solution::repeatedNumber(const vector<int> &A) {
+    // Do not write main() function.
+    // Do not read input, instead use the arguments to the function.
+    // Do not print the output, instead return values as specified
+    // Still have a doubt. Checkout www.interviewbit.com/pages/sample_codes/ for more details
+
+
+    vector <bool> v(A.size());
+    fill(v.begin(), v.end(), true);
+
+    for(int i=0;i<A.size();i++)
+        {
+            if(v[A[i]])
+            {
+              v[A[i]]=false;
+            }
+            else
+             return A[i];
+    }
+}