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sclass SimpleCircularBuffer {
A[] buffer;
long base;
int size;
*(int capacity) {
buffer = new A[capacity];
}
void add(A a) {
if (size == buffer.length) {
--size;
++base;
}
buffer[(int) ((base+size) % buffer.length)] = a;
++size;
}
A get(long pos) {
if (pos < base || pos >= base+size) null;
ret buffer[(int) ((pos-base) % buffer.length)];
}
}