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Program to find largest perimeter triangle using Python
Suppose we have an array nums of positive lengths, we have to find the largest perimeter of a triangle, by taking three values from that array. When it is impossible to form any triangle of non-zero area, then return 0.
So, if the input is like [8,3,6,4,2,5], then the output will be 19.
To solve this, we will follow these steps −
sort the list nums
a := delete last element from nums
b := delete last element from nums
c := delete last element from nums
while b+c <= a, do
if not nums is non-zero, then
return 0
a := b
b := c
c := delete last element from nums
return a+b+c
Let us see the following implementation to get better understanding −
Example
def solve(nums): nums.sort() a, b, c = nums.pop(), nums.pop(), nums.pop() while b+c<=a: if not nums: return 0 a, b, c = b, c, nums.pop() return a+b+c nums = [8,3,6,4,2,5] print(solve(nums))
Input
[8,3,6,4,2,5]
Output
19
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