Finished the constructors for the tree and nodes
Finished the constructors for the tree and nodes

smac89/UVA_OJ,smac89/UVA_OJ,smac89/playground,smac89/playground,smac89/playground,smac89/playground,smac89/playground,smac89/UVA_OJ,smac89/UVA_OJ,smac89/UVA_OJ,smac89/UVA_OJ,smac89/playground