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a month ago
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fn(nums,k)
{
     map.put(0,1);
	 for(i=0;i<n;i++)
	 {
	     psum += arr[i];
		 rem_sum = psum - k;
		 cnt += map.get(rem_sum);
		 map.put(psum,map.getOrDefault(psum,0) + 1);
	 }
	 return cnt;
}
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