What is wrong with the following code which calculates a sorted array [closed]

by 

int size=sizeof(sequence);

You probably meant 

int size=sequence.size();

which actually returns the number of elements in the std::vector container.

vector <int> s1;
for(i=0;i<size;i++)
{
    s1[i]=stoi(sequence[i]);
}

Here the problem is that the vector s1 is initialized as empty, so that you cannot change the i-th value (because it does not exist). Give the std::vector directly the correct size.

vector <int> s1(size);
for(i=0;i<size;i++)
{
    s1[i]=stoi(sequence[i]);
}

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