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# PhonePe Online Assessment Interview Experience

• Last Updated : 02 Sep, 2021

First round was a coding round in which 4 questions were asked.

Q1. Given an array A[] of N elements, You’d like to know how many triangles can be formed with side lengths equal to adjacent elements from A[].

Construct an array of integers of length N – 2 where ith element is equal to 1 if it is possible to form a triangle with side lengths A[i], A[i+1], and A[i+2]. otherwise 0.

Note: A triangle can be formed with side lengths a, b and c if a+b>c and a+c>b and b+c>a.

Example 1:

Input:

N = 4

A[] = {1, 2, 2, 4}

Output:

1 0

Explanation:

output = 1 because we can form a

triangle with side lengths 1,2 and 2.

output = 0 because 2+2<4 so, we cannot

form a triangle with side lengths 2,2 and 4.

Q2. Given an array numbers[] of N positive integers and a positive integer X, The task is to find the number of ways that X can be obtained by writing pair of integers in the array numbers[] next to each other. In other words, find the number of pairs (i,j) such that i != j and X is the concatenation of numbers[i] and numbers[j]

Example 1:

Input:

N = 4

numbers[] = {1, 212, 12, 12}

X = 1212

Output:

3

Explanation:

We can obtain X=1212 by concatenating:

numbers = 1 with numbers = 212

numbers = 12 with numbers = 12

numbers = 12 with numbers = 12

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