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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. // Optimised approach: using frequency map
  5. int main() 
  6. {
  7.     int arr[11] = { 8 , 3 , 5 , 2 , 3 , 1 , 6 , 5 , 7 , 4 , 3};
  8.     int n=11;
  9.  
  10.     /* 
  11.     Element  frequency
  12.            8             1
  13.            3              3
  14.            5              2
  15.            2              1
  16.            1              1
  17.            6              1
  18.            7              1
  19.            4              1
  20.            
  21.     */
  22.     unordered_map<int,int>frequencymap;
  23.     for(int i=0; i<n; i++)
  24.     {
  25.         frequencymap[arr[i]] = frequencymap[arr[i]] + 1;
  26.     }
  27.  
  28.  
  29.     int q;
  30.     cout<<"Enter  No of Queries"<<endl;
  31.     cin>>q;  // 2
  32.  
  33.     for(int i=0; i<q;  i++)
  34.     {
  35.         int x;
  36.         cout<<"Enter  No to find frequency"<<endl;
  37.         cin>>x;  // 5   6 
  38.  
  39.         cout<<"Frequency of "<<x<< " = " <<frequencymap[x]<<endl; // 5=2   6=1
  40.     }
  41.  
  42.     return 0;
  43. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
copy 
2
5 6
stdout
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Enter  No of Queries
Enter  No to find frequency
Frequency of 5 = 2
Enter  No to find frequency
Frequency of 6 = 1
https://ideone.com/57XldM
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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