MergeSort - Out of Range !!!
Why it alway "out of range" when I excute
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#include<iostream>
#include<vector>
using namespace std;
void Merge(vector<int> &a, vector<int> &left ,vector<int> &right)
{
int nl = left.size();
int nr = right.size();
int i= 0 , j= 0 , k = 0;
while(i < nl && j < nr)
{
if ( left[i] <= right[j] )
{
a[k] = left[i];
k++;
i++;
}
if (left[i] >= right[j] )
{
a[k] = right[j];
k++;
j++;
}
}
while(i < nl)
{
a[k] = left[i];
k++;
i++;
}
while(j < nr)
{
a[k] = right[j];
k++;
j++;
}
}
void MergeSort(vector<int> &a)
{
int n = a.size();
if ( n < 2)
{
return;
}
else
{
int mid = n/2;
vector<int> left(mid,0);
vector<int> right(n-mid,0);
for (int i = 0 ; i < mid;i++)
{
left[i] = a[i];
}
for (int j = mid ; j < n;j++)
{
right[j-mid] = a[j];
}
MergeSort(left);
MergeSort(right);
Merge(a,left,right);
}
}
void Print(vector<int> &a,int n)
{
for (int i =0;i < n;i++)
{
cout << a[i] << " ";
}
}
void main()
{
int n;
cout <<"Enter The Number:"; cin >> n;
vector<int> a(n,0);
for (int i = 0;i < n;i++)
{
a[i] = rand() + rand() +rand();
}
MergeSort(a);
Print(a,n);
}
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int mid = n/2;
///use mid=(n-1)/2
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