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restoreip.cpp
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restoreip.cpp
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class Solution {
public:
vector<string> results;
string str;
void test(int beg, int num, string res){
if(num == 4 && beg == str.size()){
results.push_back(res);
return;
}
if(beg > str.size())
return;
string temp = "";
for(int i = beg; i < beg+3 && i < str.size(); i ++){
temp += str[i];
int tempnum = atoi(temp.c_str());
if(tempnum >= 0 && tempnum <= 255){
if(num != 3)
test(i+1,num+1,res+temp+".");
else
test(i+1,num+1,res+temp);
}
if(tempnum == 0)
break;
}
}
vector<string> restoreIpAddresses(string s) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
results.clear();
if(s.size() == 0|| s.size() >12)
return results;
str = s;
string res = "";
test(0, 0, res);
return results;
}
};