Distance Vector
for (i=0; i<n; i++) {
A[i] = B[i];
B[i+1] = A[i];
}
A[0] = B[0];
B[1] = A[0];
A[1] = B[1];
B[2] = A[1];
A[2] = B[2];
B[3] = A[2];
Distance vector is the difference between the target and source iterations.
d = It-Is
Exactly the distance of the dependence, i.e.,
Is + d = It
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