【高级技巧】Lua频率衰减：祖玛教主热点值的随时间减半

local kills = {}
local function onKill(name)
    kills[name] = (kills[name] or 0) + 1   -- 只增不减，老怪霸榜
end

local hot = {}
local last = os.time()
local function onKill(actor, name)
    local now = os.time()
    for k, v in pairs(hot) do          -- 先按时间折半冷却
        hot[k] = v * 0.5 ^ ((now - last) / 600)
    end
    last = now
    hot[name] = (hot[name] or 0) + 1
    sendmsg(actor, 1, "祖玛教主当前热度 "
        .. string.format("%.1f", hot[name]))
end