【高级技巧】归并排序：有序榜单的合并封装

local function mergeBoards(a, b)
    local out = {}
    local i, j = 1, 1
    while i <= #a and j <= #b do
        if a[i].score >= b[j].score then
            out[#out + 1] = a[i]
            i = i + 1
        else
            out[#out + 1] = b[j]
            j = j + 1
        end
    end
    while i <= #a do
        out[#out + 1] = a[i]
        i = i + 1
    end
    while j <= #b do
        out[#out + 1] = b[j]
        j = j + 1
    end
    return out
end
local weekly = { { name = "甲", score = 900 } }
local last = { { name = "乙", score = 700 } }
local total = mergeBoards(weekly, last)
print(total[1].name)

print(#total .. " 条合并记录")