Container With Most Water

	/*      |
		|   |           |
		|   |       |   |
		|   |   |   |   |
		|   |   |   |   |
		-----------------
		1   2   3   4   5
	*/
	
	/**
	 * Prove of the correctness:
	 * 
	 * Because the contain volume is decided by the shorter line between
two.
	 * Since i is lower than j, so there will be no jj < j that make the
area
	 * from i,jj is greater than area from i,j so the maximum area that can
	 * benefit from i is already recorded.thus, we move i forward.
	 * 
	 * */