Lua差分数组：区间增减的批处理

-- 错误：每次操作都循环整段
for i = 50, 80 do
    a[i] = a[i] + 5
end

local function markRange(d, l, r, v)
    d[l] = (d[l] or 0) + v
    d[r + 1] = (d[r + 1] or 0) - v
end
local function restore(d, n)
    local a, run = {}, 0
    for i = 1, n do
        run = run + (d[i] or 0)
        a[i] = run
    end
    return a
end
local d = {}
markRange(d, 50, 80, 5)
markRange(d, 60, 90, -2)
local a = restore(d, 100)
local p = getplayerbyname("dif01")
sendmsg(p, 1, a[55] .. "/" .. a[85])