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  4. Arrays: Left Rotation
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Arrays: Left Rotation

  • venom1724 + 0 comments

    Indeed, its not in-place at all. Also its slow. If you are interested, here's an inplace c++ solution 

    void rotLeft(vector<int> &a, int d) {
    int c=a[d],ci=0,n=a.size(); a[d]=0;
    for(int i=n-1;i>=0;i--){
        swap(a[ci],c);
        if(!c&&i) ci+=n-i+++i;
        ci=(n+ci-d)%n;
    }
}