DSA Pattern 3: Prefix+HashMap
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YouTubeMiss Gandhi
DSA Pattern 3: Prefix+HashMap
Prefix Sum + HashMap (DSA Pattern) Used to solve subarray problems by converting “sum in a range” into a difference of prefix sums. Maintain a running prefix pref = a[0] + a[1] + ... + a[i]. A subarray (l..i) has sum k if: pref[i] - pref[l-1] = k → so we look for pref[i] - k in a HashMap. This lets you count/find subarrays in O(n) instead ...
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