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Answer3.cpp
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class Solution {
public:
void merge(vector<int>& nums1, int m, vector<int>& nums2, int n) {
if(n==0)
return;
if(m==0)
{ nums1 = nums2;
return;}
int k = m+n-1;
int i = m-1;
int j = n-1;
while(i>=0 and j>=0)
{
if(nums1[i] > nums2[j])
{
nums1[k] = nums1[i];
i--;
k--;
}
else{
nums1[k] = nums2[j];
j--;
k--;
}
}
while(i>=0)
{
nums1[k] = nums1[i];
i--;
k--;
}
while(j>=0)
{
nums1[k] = nums2[j];
j--;
k--;
}
}
};