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Given a list of servers each with an upgrade cost and a limited budget (or limited upgrade tokens), determine the maximum number of servers you can upgrade without exceeding the resource limit. This is typically solved with a greedy feasibility check — sort or use a min-heap to pick the cheapest upgrades (or binary search the answer and validate with a greedy selection).
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Leetcode 3155. Maximum Number of Upgradable Servers
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Source snapshot: Nov 12, 2026
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