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Given a list of call records (caller, callee, start/end times or durations), identify the call(s) or user(s) with the longest duration or highest total call time. The problem focuses on parsing timestamps and computing durations, then grouping/aggregating and tie-breaking—typically solved with sorting and hash-map aggregation.
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Leetcode 3124. Find Longest Calls
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Source snapshot: Nov 12, 2026
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