class Solution { public int subarraySum(int[] nums, int k) { HashMap<Long,Integer> hm=new HashMap<>(); long sum=0; int cnt=0; hm.put(sum,1); for(int i=0;i<nums.length;i++){ sum+=nums[i]; if(hm.containsKey(sum-k)){ cnt+=hm.get(sum-k); } if(hm.containsKey(sum)){ hm.put(sum,hm.get(sum)+1); } else{ hm.put(sum,1); } } return cnt; } }
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