+// Set the elements between buf[start] and buf[stop-1] to (i+value)%256
+void set(uint8_t *buf, int start, int stop, uint8_t value) {
+ for(int i = start; i < stop; i++) {
+ buf[i] = (i+value)%256;
+ }
+}
+
+// Return the number of times that an element is equal to (i+value)%256 between buf[start] and buf[stop-1].