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class Solution {

public:

void sortColors(vector<int>& nums) {

int left = 0;

int right = nums.size() - 1;

int i = 0;

while (i <= right) {

switch (nums[i]) {

case 0:

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

left++;

i++;

break;

case 1:

i++;

break;

case 2:

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

right--;

break;

}

}

}

};