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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define FR0(i,N) for(i=0;i<(N);i++)
  4. #define FR1(i,N) for(i=1;i<=(N);i++)
  5. #define FRN(i,k,N) for(i=k;i<(N);i++)
  6. #define pf printf
  7. #define db double
  8. #define max3(a,b,c) max(max(a,b),c)
  9. #define min3(a,b,c) min(min(a,b),c)
  10. #define sci(n) scanf("%d",&n)
  11. #define scl(n) scanf("%lld",&n)
  12. #define scf(n) scanf("%f",&n)
  13. #define scd(n) scanf("%lf",&n)
  14. #define scs(s) scanf("%s",&s)
  15. #define scll(n) scanf("%%I64d",&n)
  16. #define PI acos(-1.0)
  17. #define LL long long
  18. #define MX 1000005
  19. #define MOD 1000000007
  20. typedef long long int ll;
  21. typedef unsigned long long int ull;
  22. bool status[1100002];
  23. int main()
  24. {
  25.     int from,to;
  26.     string s;
  27.     while(cin>>from>>to>>s)
  28.     {
  29.         //cout<<"s = "<<s<<endl;
  30.         //int res=decimal(s,from);
  31.         if(s[0]=='0')
  32.         {
  33.             cout<<s<<" base "<<from<<" = 0 base "<<to<<endl;
  34.             //pf("%s base %d = 0 base %d\n",s,from,to);
  35.         }
  36.  
  37.         else
  38.         {
  39.             int flag;
  40.             int m,n=0;
  41.             ull sum=0;
  42.             for( int i=s.length()-1; i>=0; i--)
  43.             {
  44.                 flag=0;
  45.                 if(s[i]=='A') m=10;
  46.                 else if(s[i]=='B') m=11;
  47.                 else if(s[i]=='C') m=12;
  48.                 else if(s[i]=='D') m=13;
  49.                 else if(s[i]=='E') m=14;
  50.                 else if(s[i]=='F') m=15;
  51.                 else
  52.                 {
  53.                     m=s[i]-'0';
  54.                 }
  55.  
  56.                 if(m>=from)
  57.                 {
  58.                     //cout<<"m = "<<m<<" from = "<<from<<endl;
  59.                     flag=1;
  60.                     break;
  61.                 }
  62.                 sum+=m*pow(from,n++);
  63.             }
  64.             //cout<<"flag = "<<flag<<endl;
  65.             if(flag)
  66.             {
  67.                 //pf("%s is an illegal base %d number ",s,from);
  68.                 cout<<s<<" is an illegal base "<<from<<" number"<<endl;
  69.             }
  70.             else
  71.             {
  72.                 //cout<<"flag = "<<flag<<endl;
  73.                 ull keep=sum;
  74.                 //cout<<"sum = "<<sum<<endl;
  75.                 char temp[1000];
  76.                 int p;
  77.  
  78.                 int t=0;
  79.                 while(keep)
  80.                 {
  81.                     p=keep%to;
  82.                     if(p==10) temp[t++]='A';
  83.                     else if(p==11) temp[t++]='B';
  84.                     else if(p==12) temp[t++]='C';
  85.                     else if(p==13) temp[t++]='D';
  86.                     else if(p==14) temp[t++]='E';
  87.                     else if(p==15) temp[t++]='F';
  88.                     else
  89.                     {
  90.                         temp[t++]=p+'0';
  91.                     }
  92.                     keep/=to;
  93.                     //cout<<"p = "<<p<<"keep = "<<keep<<endl;
  94.                 }
  95.                 string result="";
  96.                 for(int j=t-1; j>=0; j--)
  97.                 {
  98.                     //cout<<temp[j];
  99.                     result+=temp[j];
  100.  
  101.                 }
  102.                 cout<<s<<" base "<<from<<" = "<<result<<" base "<<to<<endl;
  103.                // pf("%s base %d = %s base %d\n",s,from,result,to);
  104.             }
  105.         }
  106.     }
  107. }
  108. //return sum;
  109.  
  110. // cou
  111.  
  112.  
Success #stdin #stdout 0s 4536KB
comments (?)
stdin
copy 
2 10 10101
5 3 126
15 11 A4C
stdout
copy 
10101 base 2 = 21 base 10
126 is an illegal base 5 number
A4C base 15 = 1821 base 11
https://ideone.com/mmvapl
language:
C++14 (clang 8.0)
created:
10 years ago
visibility:
public

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