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- class Solution {
- public:
- int findDuplicate(vector<int>& nums) {
- int sum =0;
- int n = nums.size();
- int k;
- for(int i=0; i<n; i++){
- if(nums[i]<0) k = - nums[i];
- else k = nums[i];
- if(nums[k-1]<0){
- return k;
- }
- else{
- nums[k-1] = -nums[k-1];
- }
- }
- return 0;
- }
- };
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