[1720] Decode XORed Array

可愛的題目？！

/**

* Note: The returned array must be malloced, assume caller calls free().

*/

int* decode(int* encoded, int encodedSize, int first, int* returnSize){

int *ret = calloc(encodedSize+1, sizeof(int));

*returnSize = encodedSize+1;

ret[0]= first;

for (int i=0; i<encodedSize; i++)

ret[i+1] = encoded[i] ^ ret[i];

return ret;

}