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Trie

62. Find largest word in dictionary.
63. display all word in dictionary with starting char “ab”.
64. Find a element in an array with indefinite length.
65. Find the size of indefinite length array. Note all elements are initialized with @.
66. Find which rows is having maximum zeroes.
1 1 1 1 0
1 0 0 0 0
1 1 0 0 0
1 0 0 0 0

Once a rows got a zero there wont be any more 1’s.

67. In a matrix where each row and each column is sorted, find a number in o(1).
68. Find a element in bitonic array. Bitonic array first increase and decrese or vice versa.
69. Find a element in a rotated sorted array.
70. Find whether X is majority element in an array.
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