复原IP地址

def solve():
    def restoreIpAddresses(____):
        result = []
        def backtrack(____):
            if len(____) == ____:
                if start == len(____):
                    result.append('____'.join(____))
                return
            for i in range(____, ____):
                if start + i > len(____):
                    break
                segment = s[start:start+i]
                if len(____) > ____ and segment[____] == '____':
                    continue
                if int(____) > ____:
                    continue
                backtrack(____)
        backtrack(____, [])
        return result
    print(restoreIpAddresses(____))