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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() 
  5. {
  6.     int n;
  7.     cin>>n; // 5
  8.  
  9.     int b[n+1]; // 1 - based indexing
  10.     for(int i=1; i<=n; i++)
  11.     {
  12.         cin>>b[i]; // 1 2 3 4 5
  13.     }
  14.  
  15.     int k;
  16.     cin>>k; // 3
  17.  
  18.     int count = 0;
  19.     for(int i=1; i<=n-k+1; i++) // i=1 starting point till n-k+1 means end point 5 - 3 + 1 = 3 --> i < 3
  20.     {
  21.         // i --> start point of Each Subarray of size 'k' which we are considering
  22.         int start = i;
  23.         bool check = true;
  24.         //          'i' index it means  start index + k -  1
  25.         int end = i + k - 1;  // 1 + 3 -1 --> 3 it means till third index it will go 
  26.  
  27.         while(start < end) // Becoz I am comparing start with one index Ahead which is start + 1
  28.         {
  29.             if(b[start] < b[start + 1]) // All the Adjacent Elements should be increasing order
  30.             {
  31.                 check = true;
  32.             }
  33.             else
  34.             {
  35.                 check  = false;
  36.             }
  37.             start = start + 1;
  38.             // O(k)
  39.         }
  40.        // O(N)   
  41.  
  42.         if(check == true)
  43.         {
  44.             count = count + 1;
  45.         }
  46.     }
  47.     cout<<count;
  48.  
  49.     return 0;
  50. }
  51.  
  52. /*
  53. input:
  54. 5
  55. 1 2 3 4 5  
  56. 3
  57.  
  58. output:
  59. 3
  60.  
  61. How did the output 3 came 
  62. 1 < 2 < 3 <  4 < 5
  63.  
  64. k = 3 subarray  size should be 3
  65.  
  66. 1 < 2 < 3 --> 1 subarray
  67. 2 < 3 < 4 --> 2 subarray
  68. 3 < 4 < 5 --> 3 subarray 
  69.  
  70.  
  71. */
Success #stdin #stdout 0s 5348KB
comments (?)
stdin 
5
1 2 3 4 5
3
stdout 
3
https://ideone.com/8tU8lD
language:
C++ (gcc 8.3)
created:
12 hours ago
visibility:
public

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