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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4.   vector<int> RearrangebySign(vector<int>A, int n){
  5.  
  6.   // Define 2 vectors, one for storing positive 
  7.   // and other for negative elements of the array.
  8.   vector<int> pos;
  9.   vector<int> neg;
  10.  
  11.   // Segregate the array into positives and negatives.
  12.   for(int i=0;i<n;i++){
  13.  
  14.       if(A[i]>0) pos.push_back(A[i]);
  15.       else neg.push_back(A[i]);
  16.   }
  17.  
  18.   // If positives are lesser than the negatives.
  19.   if(pos.size() < neg.size()){
  20.  
  21.     // First, fill array alternatively till the point 
  22.     // where positives and negatives ar equal in number.
  23.     for(int i=0;i<pos.size();i++){
  24.  
  25.       A[2*i] = pos[i];
  26.       A[2*i+1] = neg[i];
  27.     }
  28.  
  29.     // Fill the remaining negatives at the end of the array.
  30.     int index = pos.size()*2;
  31.     for(int i = pos.size();i<neg.size();i++){
  32.  
  33.         A[index] = neg[i];
  34.         index++;
  35.     }
  36.   }
  37.  
  38.   // If negatives are lesser than the positives.
  39.   else{
  40.  
  41.       // First, fill array alternatively till the point 
  42.       // where positives and negatives ar equal in number.
  43.       for(int i=0;i<neg.size();i++){
  44.  
  45.       A[2*i] = pos[i];
  46.       A[2*i+1] = neg[i];
  47.   }
  48.  
  49.     // Fill the remaining positives at the end of the array.
  50.     int index = neg.size()*2;
  51.     for(int i = neg.size();i<pos.size();i++){
  52.  
  53.         A[index] = pos[i];
  54.         index++;
  55.     }
  56.   }
  57.   return A;
  58.  
  59. }
  60.  
  61. int main() {
  62.  
  63.   // Array Initialisation.
  64.   int n = 6;
  65.   vector<int> A {1,2,-4,-5,3,4};
  66.  
  67.   vector<int> ans = RearrangebySign(A,n);
  68.  
  69.   for (int i = 0; i < ans.size(); i++) {
  70.     cout << ans[i] << " ";
  71.   }
  72.  
  73.   return 0;
  74. }
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/43Temz
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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