text: Calculate sum of remaining squares in current row by removing the leftmost strip of previous sub - square and adding a new strip
code: for j in range ( 1 , n - k + 1 ) : NEW_LINE INDENT Sum += ( stripSum [ i ] [ j + k - 1 ] - stripSum [ i ] [ j - 1 ] ) NEW_LINE print ( Sum , end = " ▁ " ) NEW_LINE DEDENT print ( ) NEW_LINE