Submission #1777341

---

Source Code Expand

#include<iostream>
#include<cstring>
#include<stdbool.h>
using namespace std;
int main(){
  char str[100001];
  bool ans[26];
  char out;
  for(int i=0;i<26;i++)
    ans[i]=true;

  cin >> str;
  for(int i=0;i<strlen(str);i++){
    ans[str[i]-'a']=false;
  }
  
  int cnt;
  for(cnt=0;cnt<26;cnt++){
    if(ans[cnt]){
      out='a'+cnt;
      break;
    }
  }
   
  if(cnt==26)
    cout << "None" << endl;
  else
    cout << out << endl;
  return 0;
}

Submission Info

Judge Result