class Solution {
public:
string reformat(string s) {
string a, b;
for (auto c : s)
{
if (isdigit(c)) a += c;
if (isalpha(c)) b += c;
}
if (a.size() < b.size()) swap(a, b);
if (a.size()-b.size() > 1) return "";
string ret;
for (int i = 0; i < a.size(); ++ i)
{
ret += a[i];
if (i < b.size()) ret += b[i];
}
return ret;
}
};
C++/C语言函数:isalpha()函数 isdigit(int c)宏
class Solution {
public:
string reformat(string s) {
string a, b, x;
for(char c : s) if(isdigit(c)) a.push_back(c);
else b.push_back(c);
int m = min(a.size(), b.size());
for(int i = 0; i < m; i += 1){
x.push_back(a[i]);
x.push_back(b[i]);
}
if(abs((int)a.size() - (int)b.size()) > 1) return "";
if((int)a.size() == (int)b.size()) return x;
if((int)a.size() > (int)b.size()) return x + a.back();
return b.back() + x;
}
};
重点：