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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. bool cmp(pair<int, int> a, pair<int, int> b) {
  6. 	if(a.second == b.second) {
  7. 		return a.first < b.first;
  8. 	}
  9.  
  10. 	return a.second > b.second;
  11. }
  12.  
  13. void sortByFreq(int a[], int n) {
  14.  
  15. 	unordered_map<int, int> m;
  16.  
  17. 	for(int i = 0; i < n; i++) {
  18. 		m[a[i]]++;
  19. 	}
  20. 	vector<pair<int, int>> v;
  21. 	unordered_map<int, int> :: iterator it;
  22. 	for(auto it: m) {
  23. 		// cout<<it->first<<"   "<<it->second<<endl;
  24. 		v.push_back({it.first, it.second});
  25. 	}
  26. 	for(int i = 0; i < v.size(); i++) {
  27.  
  28. 		cout<<v[i].first<<"   " ;
  29. 	}
  30. 	cout<<endl;
  31. 	sort(v.begin(), v.end(), cmp);
  32.  
  33. 	for(auto i : v) {
  34. 		int s = i.second;
  35. 		while(s > 0) {
  36. 				cout<<i.first<<"   " ;
  37. 				s--;
  38. 		}
  39.  
  40. 	}
  41.  
  42. }
  43.  
  44. int main() {
  45. 	int a[] = { 2, 5, 2, 6, -1, 9999999, 5, 8, 8, 8 };
  46.    int n = sizeof(a) / sizeof(a[0]);
  47.    sortByFreq(a, n);
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 4892KB
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stdin
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Standard input is empty
stdout
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8   5   -1   2   6   9999999   
8   8   8   2   2   5   5   -1   6   9999999
https://ideone.com/Owodxs
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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