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- #include <iostream>
- #include <string>
- using namespace std;
- string razy(string a, int b)
- {
- int sum;
- for(int i=a.size()-1;i>=0;i++){
- sum+=b*a[i];
- a[i]=sum%10;
- sum/=10;
- }
- string dodaj="";
- while(sum>0){
- dodaj.push_back(sum%10);
- sum/=10;
- }
- string pierwsze=dodaj;
- for(int i=0;i<dodaj.size();i++){
- pierwsze[i]=dodaj[dodaj.size()-i-1];
- }
- return pierwsze+a;
- }
- string silnia(int n)
- {
- string num="";
- num.push_back(1);
- for(int i=2;i<=n;i++){
- num=razy(num,i);
- }
- return num;
- }
- int main()
- {
- int n;
- cin>>n;
- cout<<silnia(n);
- return 0;
- }
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