[modify] N queens
	modified:   n-queen/n-queen.cc
[modify] N queens II
	modified:   n-queenII/n-queenII.cc
[add] spiral matrix II
	new file:   spiral-matrixII.cc
[add] spiral matrix
	new file:   spiral-matrix.cc
[modify] spiral matrix II
	modified:   spiral-matrixII.cc