Fix bugs

ConflictSet.cpp

@@ -101,7 +101,9 @@ struct BitSet {
 
   int firstSetGeq(int i) const {
     assert(0 <= i);
-    assert(i < 256);
+    if (i >= 256) {
+      return -1;
+    }
     if (i < 128) {
       int a = std::countr_zero(lo >> i);
       if (a < 128) {
@@ -1319,9 +1321,11 @@ void addWriteRange(Node *&root, int64_t oldestVersion,
       break;
     }
 
-    n = getChildExists(n, c);
+    n->maxVersion = std::max(n->maxVersion, w.writeVersion);
+
     remaining = remaining.subspan(n->partialKeyLen + 1,
                                   remaining.size() - (n->partialKeyLen + 1));
+    n = getChildExists(n, c);
   }
 
   Node **useAsRoot = n->parent == nullptr