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  1. #include <cctype>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. int main()
  6.   {
  7.    char sum='0';
  8.    for(char ch=0;isdigit(ch=cin.get());) if((sum+=ch-'0')>'9') sum-=9;
  9.    cout<<sum<<endl;
  10.    return 0;
  11.   }
Success #stdin #stdout 0s 3300KB
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stdin
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231476231946230184623794679238168492139846213896498032174892374902374892348932614973264702316473216094632189046321640392186490321643164109327648930126412836403216403261479012364321746032164723146238976432894632189463291784692146321789463219846932871649823131
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4
https://ideone.com/ldM2CQ
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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