class Solution {
public:
int countPairs(vector<int>& nums, int k) {
int n=nums.size();
int c=0;
for(int i=0;i<n-1;i++)
{
for(int j=i+1;j<n;j++)
{
int p=i*j;
if(nums[i]==nums[j]&&p%k==0) c++;
}
}
return c;
}
};
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