
 The th subtree of the tree of the HWSNs 
 The number of the sensor nodes in 
 The state information of all the nodes in 
 One of the source nodes in 
 The root node (macronode) in 
 The set of all the possible paths between and in 
 The th path between and in 
 The failed relay node of in 
 The child node of of in 
 The parent node of of in 
 The th sensor node of in 
 The optimal path of with optimal fitness in 
 The th sensor node of in 
