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class Solution {

public:

int search(vector<int>& nums, int target) {

int left = 0, right = nums.size() - 1;

while (left <= right) {

int mid = (left + right) / 2;

if (nums[mid] == target) {

return mid;

} else if (nums[mid] < target) {

left = mid + 1;

} else {

right = mid - 1;

}

}

// nums[right] < target < nums[left], 0 element

return -1;

}

};