Question

write the solution of the program by python 3 language :
I need the program using list or string or loops (while and for) or if,elif,else :

You are given a sequence of n non-zero integers a1,a2,…,an.

Determine if the given sequence contains a pair of adjacent elements of the same sign (both negative or both positive). Two elements are called adjacent if they stand next to each other in the sequence.

Input
The first line contains an integer n (1≤n≤1000) — the length of the sequence.

The second line contains n space-separated non-zero integers a1,a2,…,an (−1000≤ai≤1000,ai≠0) — the elements of the sequence.

Output
Print YES if the given sequence contains a pair of adjacent elements of the same sign, and print NO otherwise.

Examples
input
5
2 -3 8 -1 7
output
NO
input
4
-3 5 7 -4
output
YES

Answer 1

#Python program

n = int(input())
List = []
valid = False
List = list(map(int, input().split()))

for i in range(1,n):
    if (List[i-1] > 0 and List[i] > 0) or (List[i-1] < 0 and List[i] < 0):
        valid = True

if(valid):
    print("YES")
else:
    print("NO")

#Screenshot

File Edit Format Run Options Window Help n = int(input()) List = [] valid = False List = list (map (int, input().split())) for i in range (1,n): if (List[i-1] > 0 and List[i] > 0) or (List[i-1] < 0 and List[i] < 0): valid = True if(valid): print("YES") else: print("NO") П - Python 3.7.3 Shell File Edit Shell Debug Options Window Help Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Inte 1)] on win32 Type "help", "copyright", "credits" or "license ()" for more information. RESTART: C:\Users\IshuManish\AppData\Local\Programs\Python\Python37-32\adjacent Same.py N in 2 -3 8 -1 7 NO >>> RESTART: C:\Users\IshuManish\AppData\Local\Programs\Python\Python37-32\adjacent Same.py 4 -3 5 7 -4 YES