Lua两数之和：哈希换空间的一次定位

local function findTwo(nums, target)
    for i = 1, #nums do
        for j = i + 1, #nums do
            if nums[i] + nums[j] == target then
                return i, j
            end
        end
    end
end

local function findTwoFast(nums, target)
    local seen = {}
    for i = 1, #nums do
        local need = target - nums[i]
        if seen[need] then
            return seen[need], i
        end
        seen[nums[i]] = i
    end
end
local p = getplayerbyname("sum01")
local a, b = findTwoFast({30, 70, 40, 60}, 100)
sendmsg(p, 1, "第 " .. a .. " 与第 " .. b .. " 笔凑足 100")