Continuous Sub Array Sum (Leet Code)

bool checkSubarraySum(vector<int>& n, int k) 
unordered_set<int> _remainders;
int prevRemainder = 0;
int s = 0;

for (int i = 0; i < n.size(); i++)
s += n[i];

int remainder = k == 0 ? s : s % k;

if (_remainders.count(remainder) != 0) return true;

prevRemainder = remainder;

return false;





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