notes/Wiki/Notes for CS.md

1. use int arr[][Columns] for 2-d function declaration
2. #pragma gcc optimize("Ofast, inline") to increase speed
3. use parens to close bitwise operations and %
4. remember the scope in loops (int i) (int j)
5. matrix[i][j] in scanning a 2d array.
6. figure out matrix[i][j] and matrix[i][n-1]

More can be found in OJ-index