var dic = ["swift": [5, 7, 0, 1],
"c++": [8, 9, 4, 3],
"python": [3, 2, 0, 5]]
print(dic)
for key in dic.keys {
dic[key]?.sort(by: <)
}
print(dic)
/*
run:
["swift": [5, 7, 0, 1], "c++": [8, 9, 4, 3], "python": [3, 2, 0, 5]]
["swift": [0, 1, 5, 7], "c++": [3, 4, 8, 9], "python": [0, 2, 3, 5]]
*/