Leet - 93

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Problem 93. Restore IP Addresses

My attempt(s)

Code

Python

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class Solution(object):
    def restoreIpAddresses(self, s):
        if (len(s)<4) or (len(s)>12):
            return []
        else:
            output=[]

            def get_output(list_temp):
                def judge(string_temp):
                    if ((string_temp[0]=="0") and(len(string_temp)>1)) or (int(string_temp)>255):
                        return False
                    else:
                        return True
                
                for item in list_temp:
                    cnt=0
                    s1=s[cnt: cnt+int(str(item)[0])]
                    if !judge(s1):
                        continue
                    cnt+=int(str(item)[0])
                    s2=s[cnt: cnt+int(str(item)[1])]
                    if !judge(s2):
                        continue
                    cnt+=int(str(item)[1])
                    s3=s[cnt: cnt+int(str(item)[2])]
                    if !judge(s3):
                        continue
                    cnt+=int(str(item)[2])
                    s4=s[cnt:cnt+int(str(item)[3])]
                    if !judge(s4):
                        continue
                    ss= s1+"."+s2+"."+s3+"."+s4
                    if ss in output:
                        continue
                    else:
                        output.append(ss)
                return output

            if (len(s)-4==0):
                return [s[0]+"."+s[1]+"."+s[2]+"."+s[3]]          
            elif (len(s)-4==1):
                return get_output([2111,1211,1121,1112])
            elif (len(s)-4==2):
                return get_output([1122,1212,1221,2112,2121,2211,3111,1311,1131,1113])
            elif (len(s)-4==3):
                return get_output([2221,2212,2122,1222,3211,3121,3112,2311,2131,2113,1321,1312,1231,1213,1132,1123])
            elif (len(s)-4==4):
                return get_output([2222,3221,3212,3122,2321,2312,2231,2213,2132,2123,1322,1232,1223,3311,3131,3113,1331,1313,1133])
            elif (len(s)-4==5):
                return get_output([3222,2322,2232,2223,3321,3312,3231,3213,3132,3123,2331,2313,2133,1332,1323,1233])
            elif (len(s)-4==6):
                # list_t=[3322,3232,3223,2332,2323,2233,3331,3313,3133,1333]
                print(6)
                return get_output([3322,3232,3223,2332,2323,2233,3331,3313,3133,1333])
            elif (len(s)-4==7):
                # list_t=[3332,3323,3233,2333]
                print(7)
                return get_output([3332,3323,3233,2333])
            elif (len(s)-4==8):
                # list_t=[3333]
                print(8)
                return get_output([3333])

Explanation of idea

A silly but ok fast and easy understand method

Good solution ref.

Code

Analysis

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