Решение задачи Array 39

#include <stdio.h>
 
int main(void)
{
    int a[10];
    int n;
 
    printf("N: ");
    scanf("%i",&n);
 
    int i,num=0;
    for (i=0; i<n; ++i){
        printf("a[%i] : ",i+1);
        scanf("%i",&a[i]);
    }
 
    for (i=2;i<n;++i){
        if ((a[i-2]>a[i-1]) && !(a[i-1]>a[i])){
            ++num;
        }
        if ((a[i-2]<a[i-1]) && !(a[i-1]<a[i])){
            ++num;
        }
    }
 
    if (a[n-2]!=a[n-1]) ++num;
 
    printf("%i \n",num);
    return 0;
}

import random

N = random.randrange(2,21)
#N = 15
a = [random.randrange(1,10) for i in range(N)]

##N = 12
##a = [6, 5, 3, 5, 5, 2, 4, 9, 8, 8, 2, 6]
##a = [3, 3, 1, 8, 9, 6, 9, 2, 6, 6, 2, 6, 2, 9, 6]
#a = [7, 2, 1, 8, 2, 8, 6, 9, 9, 2, 2, 2, 8, 9, 5]

##for i in range(0,N):
##    a[i] = N - i
##a[7] = 0
##a = [17, 13, 15]

print("N = ", N)
print("Array:")
print(a)

dec_k = 0
dec_flag = True
for i in range(1,N):
    if a[i-1] > a[i] :
        if dec_flag:
            dec_k += 1
            dec_flag = False
    else :
        dec_flag = True
print("Monotonous Decrease intervals:",dec_k)

inc_k = 0
inc_flag = True
for i in range(1,N):
    if a[i-1] < a[i] :
        if inc_flag:
            inc_k += 1
            inc_flag = False
    else :
        inc_flag = True
print("Monotonous Increase intervals:",inc_k)

print("Monotonous intervals:",inc_k+dec_k)

import matplotlib.pyplot as plt
plt.plot(a)
plt.show()
									

program Array39;
var
  a:array[1..10] of integer;
  N,i,Num:Integer;
 
begin
  a[1]:=0;
  Write('N: ');
  Readln(N);
  for i:=1 to N do
   begin
    write(i,' :');
    readln(a[i]);
   end;
 
  Num:=0;
 
  for i:=3 to N do
  begin
    if (a[i-2]>a[i-1]) and not(a[i-1]<a[i]) then inc(Num);
    if (a[i-2]<a[i-1]) and not(a[i-1]>a[i]) then inc(Num);
  end;
  if not(a[N-1]=a[N]) then inc(Num);
 
 
  Writeln(Num);
  readln;
end.