new file:   searchInsert.cpp
new file:   deleteDuplicates.cpp
new file:   generateTrees.cpp
Merge branch 'master' of github.com:wang2453/codes
Merge branch 'master' of github.com:wang2453/codes
 Changes to be committed:
new file:   isBalanced.cpp
new file:   isBalanced_Improve.cpp
new file:   romanToInt.cpp
modified:   model.cpp
new file:   solveNQueens.cpp
new file:   merge.cpp
new file:   solveNQueensII.cpp
new file:   solveNQueensII_2.cpp
new file:   isSymmetric.cpp
new file:   isSymmetric2.cpp