样例
blablabla
算法1
C++ 代码
#include <iostream>
#include <string>
using namespace std;
int a[26];
int main()
{
string s;
cin >> s;
for(char c : s)
{
a[ c - 'a'] ++;
}
for(char x : s)
{
if(a[x - 'a'] == 1)
{
cout << x;
return 0;
}
}
cout << "no";
return 0;
}