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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define rep(i,a,b) for(int i=a;i<b;i++)
  4. #define ll unsigned long long
  5. class ThreeDigits{
  6.   public: bool checkzero=false;
  7.   public:
  8.     ll power(ll x,ll y,ll mod){
  9.       if(y<=0) return 1;
  10.       ll z=power(x,y/2,mod);
  11.       if(y%2){
  12.         if((z*z)>= mod || (z*z*x)>=mod)  checkzero=true;
  13.         return (((z*z)%mod)*x)%mod;
  14.       }
  15.       else {
  16.         if((z*z)>= mod) checkzero=true;
  17.         return (z*z)%mod;
  18.       }
  19.     }
  20.   public:
  21.     string calculate(int X, int Y, int Z) {
  22.       checkzero=false;
  23.       ll n1=X,y=Y,z=Z;
  24.       ll res=power(n1,y,z*1000LL);
  25.       long double ans=(res*1.0)/z;
  26.       string x=to_string(ans);
  27.       int idx=1;
  28.       rep(i,0,x.length()) if(x[i]=='.') {idx=i;break;}
  29.       string final_ans="";
  30.       if(checkzero) rep(i,0,3-idx) final_ans+="0";
  31.       rep(i,0,idx+4) final_ans+=x[i];
  32.       // cout<<final_ans<<endl;
  33. 		  return final_ans;
  34. 	  }
  35.    void print(){
  36.      cout<<calculate(3,5,7)<<endl;
  37.      cout<<calculate(4,7,32)<<endl;
  38.      cout<<calculate(3,2,36)<<endl;
  39.      cout<<calculate(7,4,47)<<endl;
  40.      cout<<calculate(13,6,479)<<endl;
  41.      cout<<calculate(1234,56789,123456)<<endl;
  42.      cout<<calculate(999999999,128,1000000)<<endl;
  43.    }
  44. };
  45. int main(){
  46.   //freopen("input.txt", "r", stdin); // redirects standard input
  47.   //freopen("output1.txt", "w", stdout); // redirects standard output
  48.   ThreeDigits obj;
  49.   obj.print();
  50.   //int t;
  51.   //cin>>t;
  52.   //while(t--){
  53.   //  int x,y,z;
  54.   //  cin>>x>>y>>z;
  55.   //  cout<<obj.calculate(x,y,z)<<endl;
  56.   //}
  57. }
  58.  
Success #stdin #stdout 0s 4400KB
comments (?)
stdin 
Standard input is empty
stdout 
34.714
512.000
0.250
51.085
076.845
133.942
000.000
https://ideone.com/euCFof
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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