http://www.geeksforgeeks.org/divide-conquer-set-6-search-row-wise-column-wise-sorted-2d-array/

http://www.geeksforgeeks.org/remove-minimum-elements-either-side-2min-max/

http://www.geeksforgeeks.org/minimum-length-subarray-sum-greater-given-value/

Rearrange array in alternating positive & negative items with O(1) extra space

http://www.geeksforgeeks.org/rearrange-array-alternating-positive-negative-items-o1-extra-space/