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0075-sort-colors.cpp

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class Solution {

public:

void sortColors(vector<int>& nums) {

int p1=0,p2=nums.size()-1;

for(int i=p1;i<=p2;i++)

{

if(nums[i]==0)

{

swap(nums[i],nums[p1]);

p1++;

}

if(nums[i]==2)

{

swap(nums[i],nums[p2]);

p2--;

i--;

}

}

}

};