What's the sum of all the numbers filled into a sudoku(数独)puzzle?
NOTE: A sudoku puzzle is a 9x9 grid.
Each line and column needs to be filled with number 1 through 9 without repetition.
There are 9 3x3 squares in the 9x9 grid, each 3x3 square needs to be filled with numbers 1 through 9 without repetition.
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In a sudoku puzzle, every integer from 1 to 9 appears exactly 9 times, so the sum of all its numbers is 9 ∗ ( 1 + 2 + . . . + 9 ) = 9 ∗ 4 5 = 4 0 5