Bug fixed for Zero coefficient in goal

PbSolver.C

@@ -76,18 +76,25 @@ void PbSolver::addGoal(const vec<Lit>& ps, const vec<Int>& Cs)
     //**/debug_names = &index2name;
     //**/reportf("MIN: "); dump(ps, Cs); reportf("\n");
   assert(ps.size() == Cs.size());
-  assert(ps.size() > 0);
-  //if (ps.size() == 0) return;
+  assert(ps.size() >= 0);
+
   // GCD;
   vec<Int> norm_Cs;
   if(opt_goal_gcd) {
-    assert(Cs[0] != 0);
-    if(Cs[0] < 0) goal_coeff = -Cs[0]; else goal_coeff = Cs[0];
-    for (int i = 1; i < Cs.size(); i++) {
-      assert(Cs[i] != 0);
-      if(Cs[i] < 0) goal_coeff = gcdg(goal_coeff, -Cs[i]);
-      else goal_coeff = gcdg(goal_coeff, Cs[i]);
-    }
+    int i = 0; bool emptyGoal = true;
+    for (; i < Cs.size(); i++) {
+      if(Cs[i] != 0) {
+        if(Cs[i] < 0) goal_coeff = -Cs[i]; else goal_coeff = Cs[i];
+	emptyGoal = false;
+	break;
+      }
+    } reportf("i=%d\n",i);
+    if(!emptyGoal)
+      for (; i < Cs.size(); i++) {
+        if(Cs[i] < 0) goal_coeff = gcdg(goal_coeff, -Cs[i]);
+        else if(Cs[i] > 0) goal_coeff = gcdg(goal_coeff, Cs[i]);
+      }
+    else goal_coeff = 1;
   } else goal_coeff = 1;
 
   if(opt_verbosity >=1 )

[Masahiko Sakai]

This modification is for privent abort caused by zero coefficients in goal function like min: +0 x1 ;