def cardinalitySort(nums):
    return sorted(nums, key=lambda num: [bin(num).count('1'), num])

Cardinality sorting

#include <bits/stdc++.h>
using namespace std;
bool checkbit(int n,int i){
    return n&(1<<i);
}
bool cmp(const pair<int,int> &a,const pair<int,int>&b){
    return a.second<b.second;
}
int main() {
 
  int n;cin>>n;
  int a[n];
  for(int i=0;i<n;i++) cin>>a[i];
  vector<pair<int,int>> v;
  for(int i=0;i<n;i++){
      int c=0;
      for(int j=0;j<31;j++){
          if(checkbit(a[i],j)) c++;
      }
      v.push_back({a[i],c});
  }
  int idx = 0;
  sort(v.begin(),v.end(),cmp);
  for(auto it : v){
      a[idx++] = it.first;
      cout<<it.second<<" ";
  }
  for(int i=0;i<n;i++){
      cout<<a[i]<<" ";
  }
  return 0;
}

C++

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def minimumCost(price):
    n = len(price)
    price.append(0)
    ans = float('inf')
    last = {price[0]: 0}
    for i in range(1, n):
        v = price[i]
        price[i] += price[i - 1]
        if last.get(v) != None:
            ans = min(ans, price[i] - price[last[v]] + v)
        last[v] = i
    return ans if ans != float('inf') else -1

n = int(input())
price = list(map(int,input().split(' ')))
print(minimumCost(price))

Python 3
Amazon

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