Combinations

 https://www.interviewbit.com/problems/combinations/

 


void comb(int n, int k, int st, vector<vector<int> > &v, vector<int> v1)
{
    if(k == 0)
    {
        v.push_back(v1);
        return;
    }
    for(auto i=st; i<=n; i++)
    {
        v1.push_back(i);
        comb(n, k-1, i+1, v, v1);
        v1.pop_back();
    }
}


vector<vector<int> > Solution::combine(int n, int k) {
    vector<vector<int> > v;
    vector<int> v1;
    
    comb(n, k, 1, v, v1);
    sort(v.begin(), v.end());
    
    return v;
}


 

Comments

Post a Comment

Popular posts from this blog

Perfect Peak of Array

  Given an integer array A of size N . You need to check that whether there exist a element which is strictly greater than all the elements on left of it and strictly smaller than all the elements on right of it. If it exists return 1 else return 0 .  https://www.interviewbit.com/old/problems/perfect-peak-of-array/ int Solution::perfectPeak(vector<int> &A) { int ans=-1; int l[A.size()]; int r[A.size()]; l[0]=A[0]; r[A.size()-1]=A[A.size()-1]; for(int i=1;i<A.size();i++){     l[i] = max(A[i],l[i-1]); } for(int i=A.size()-2;i>=0;i--){     r[i] = min(A[i],r[i+1]); } for(int i=1;i<A.size()-1;i++){     if(A[i]>l[i-1]&&A[i]<r[i+1]){         return 1;     } } if(ans==-1){     return 0; } }  
Read more

Is Rectangle?

 https://www.interviewbit.com/old/problems/is-rectangle/ int Solution::solve(int A, int B, int C, int D) {      if (((A==B)&&(C==D))||((A==C)&&(B==D))||((A==D)&&(B==C))){         return 1;     }else{         return 0;     } }  
Read more

Sort array with squares!

 https://www.interviewbit.com/old/problems/sort-array-with-squares/      vector<int> Solution::solve(vector<int> &arr) {         int mid=0;     for(int i=0;i<arr.size();i++)     {         if(arr[i]>=0)         {             mid=i;             break;         }     }     int i=mid-1,j=mid;     vector<int>res(arr.size());     int k=0;     while(i>=0 && j<arr.size())     {         if((arr[i]*arr[i])<(arr[j]*arr[j]))         {             res...
Read more