Best way to compare two int arrays of the same length?

Use the standard memcmp function from <string.h>.

memcmp(a, b, sizeof(a)) == 0

whenever a and b are equal.

If you mean

int a[] = {0,1,0,0,1};
int b[] = {0,1,0,0,1};
int c[] = {1,1,0,0,1};

then

memcmp(a, b, sizeof(a)); /* returns zero for a match */
memcmp(a, c, sizeof(a)); /* returns nonzero for no match */

Use a loop and compare the individual elements one after another.

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