22 lines
284 B
C++
22 lines
284 B
C++
#include<iostream>
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#include<string>
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using namespace std;
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int main()
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{
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string s;
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cin>>s;
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int le[26]={0};
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for(int i=0;i<s.size();i++) le[s[i]-'a']++;
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for(int i=0;i<s.size();i++)
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{
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if(le[s[i]-'a']==1)
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{
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cout<<s[i]<<endl;
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return 0;
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}
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}
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cout<<"no"<<endl;
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return 0;
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}
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