Array task. Finding last two negative numbers in array-CodePudding

Search for the numbers of the last two consecutive negative elements in an array. The length of the array is entered from the keyboard. Float type.

my code is:

import math
import numpy
import random
#i = (random.uniform(-1000, 1000))
o = []
a = []
n = int(input())
n  = 1
l = 0
sh = 1
m2 = n
m = n-1
m=int(m)
for i in range(n):
    x = (random.uniform(-1000, 1000))
    a.append(x)
for i in range(m):
    otric = a.pop(m)
    otric = int(otric)
    a.insert(otric,int(m 1))
    if otric < 0:
        o.append(otric)
        m -= 1
        if len(o) > 2: break
print(a)
print(o)

and this doesn't work, idk how to fix it.. please help

CodePudding user response：

Use zip to get all consecutive negative numbers and return the last element of the resulting list:

a = [random.uniform(-1000, 1000) for _ in range(n)]
>>> [(x,y) for x,y in zip(a, a[1:]) if x<0 and y<0][-1]
(-696.9270891497699, -612.4999984966855)

CodePudding user response：

Iterate the list in reverse and when a value is negative also grab the next one and see if it is the pair we're looking for:

lst = [1, -7, -8, 1, 1, -1, 1, -2, -3, 1, -4, 1, -5, 1, 1]

it = reversed(lst)
for a in it:
    if a < 0:
         b = next(it, 0)
         if b < 0:
             print(b, a)
             break