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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int trips(int weight[],int num){
  4. 	unordered_map<int,int>w;
  5. 	int count;
  6. 	for(int i=0;i<num;i++){
  7. 		w[weight[i]]++;
  8. 	}
  9. 	int ans=0;
  10. 	for(auto a:w){
  11. 		int c=a.second;
  12. 		if(c==1){
  13. 			return -1;
  14. 		}
  15. 		if(c%3==0){
  16. 			count=c/3;
  17. 		}
  18. 		else{
  19. 			count=c/3+1;
  20. 		}
  21. 		ans=ans+count;
  22. 	}
  23. 	return ans;
  24.  
  25. }
  26.  
  27. int main() {
  28. 	// your code goes here
  29. 	int n;
  30. 	cin>>n;
  31. 	int packageWeight[n];
  32. 	for(int i=0;i<n;i++){
  33. 		cin>>packageWeight[i];
  34. 	}
  35. 	cout<<"the minimum number of trips are:"<<trips(packageWeight,n);
  36. 	return 0;
  37. }
Success #stdin #stdout 0.01s 5280KB
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the minimum number of trips are:3
https://ideone.com/6fiKJc
language:
C++ (gcc 8.3)
created:
22 hours ago
visibility:
public

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