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restore-ip-addresses.cpp
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restore-ip-addresses.cpp
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class Solution {
public:
vector<string> v;
void handle(const string s, const string res, const int level)
{
if(level == 4 && s == "")
{
v.push_back(res);
return;
}
int sz = s.size();
int left = 4 - level;
if(sz < left || sz > left * 3)
return;
int mini = (sz-(left-1)*3>0?sz-(left-1)*3:1);
int maxi = (sz-(left-1)>3?3:sz-(left-1));
string stmp;
for(int i = mini; i <= maxi; ++i)
{
if(s[0] == '0' && i > 1)
break;
stmp = s.substr(0, i);
int num = atoi(stmp.c_str());
if(num > 255)
break;
if(level == 3)
handle(s.substr(i), res + stmp, level + 1);
else
handle(s.substr(i), res + stmp + ".", level + 1);
}
}
vector<string> restoreIpAddresses(string s) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
v.clear();
for(int i = 0; i < s.size(); ++i)
if(!(s[i] >= '0' && s[i] <= '9'))
return v;
string res = "";
handle(s, res, 0);
return v;
}
};