WhiteCells | Topcoder Archive

Problem Statement

A chessboard is an 8 x 8 grid of cells. Within each column and within each row, cells alternate between black and white. The cell in the upper left corner (0, 0) is white. You are given a String[] board, where the j-th character of the i-th element is 'F' if the cell in the j-th column from the left and i-th row from the top is occupied, or '.' if it is empty. Return the number of occupied white cells on the board.

Definition

Class:: WhiteCells
Method:: countOccupied
Parameters:: String[]
Returns:: int
Method signature:: int countOccupied(String[] board)
(be sure your method is public)

Constraints

board will contain exactly 8 elements.
Each element of board will contain exactly 8 characters.
board will contain only the characters '.' and 'F'.

Examples

{"........",
 "........",
 "........",
 "........",
 "........",
 "........",
 "........",
 "........"}

Returns: 0

{"FFFFFFFF",
 "FFFFFFFF",
 "FFFFFFFF",
 "FFFFFFFF",
 "FFFFFFFF",
 "FFFFFFFF",
 "FFFFFFFF",
 "FFFFFFFF"}

Returns: 32

{".F.F...F",
 "F...F.F.",
 "...F.F.F",
 "F.F...F.",
 ".F...F..",
 "F...F.F.",
 ".F.F.F.F",
 "..FF..F."}

Returns: 1

{"........",
 "..F.....",
 ".....F..",
 ".....F..",
 "........",
 "........",
 ".......F",
 ".F......"}

Returns: 2

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