class Solution {
public:
int findDuplicate(vector<int>& nums) {
int slow = nums[0];
int fast = nums[0];
do{
slow = nums[slow];
fast = nums[nums[fast]];
}while(slow != fast);
slow = nums[0];
int ans = fast;
while(fast != slow){
fast = nums[fast];
slow = nums[slow];
ans = slow;
}
return ans;
}
};
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