#include <bits/stdc++.h>
#define CIN ios_base::sync_with_stdio(0); cin.tie(0)
using namespace std;
bool p[1000000];
vector<int>prime;
void sieve(long long n)
{
p[0]=p[1]=1;
for(long long i=2; i<n;)
{
prime.push_back(i);
for(long long j=i*i; j<n; j+=i)
p[j]=1;
for(++i;;i++)
{
if(!p[i]) break;
}
}
}
long long phi(long long n)
{
long long ans=n;
for(long long i=0; prime[i]<=sqrt(n); i++)
{
if(n%prime[i]==0)
{
while(n%prime[i]==0)
{
n/=prime[i];
}
ans-=ans/prime[i];
}
}
if(n>1)
{
ans-=ans/n;
}
return ans;
}
int main()
{
CIN;
long long n;
sieve(1000000);
while(cin>>n)
{
if(n==1)
{
cout<<0<<endl;
continue;
}
if(n==0) break;
cout<<phi(n)<<endl;
}
}
Page 47 of 66
UVa – 10179 – Irreducible Basic Fractions
#include <bits/stdc++.h>
#define CIN ios_base::sync_with_stdio(0); cin.tie(0)
using namespace std;
bool p[1000000];
vector<int>prime;
void sieve(long long n)
{
p[0]=p[1]=1;
for(long long i=2; i<n;)
{
prime.push_back(i);
for(long long j=i*i; j<n; j+=i)
p[j]=1;
for(++i;;i++)
{
if(!p[i]) break;
}
}
}
long long phi(long long n)
{
long long ans=n;
for(long long i=0; prime[i]<=sqrt(n); i++)
{
if(n%prime[i]==0)
{
while(n%prime[i]==0)
{
n/=prime[i];
}
ans-=ans/prime[i];
}
}
if(n>1)
{
ans-=ans/n;
}
return ans;
}
int main()
{
//freopen("in.txt","r",stdin);
CIN;
long long n;
sieve(1000000);
while(cin>>n)
{
if(n==1)
{
cout<<1<<endl;
continue;
}
if(n==0) break;
cout<<phi(n)<<endl;
}
}
UVa – 10127 – Ones
#include <bits/stdc++.h>
#define sf scanf
#define pf printf
#define ms(a,b) memset(a,b,sizeof(a))
#define pb(a) push_back(a)
#define db double
#define ft float
#define ll long long
#define ull unsigned long long
#define ff first
#define ss second
#define sz(x) x.size()
#define qu queue
#define pqu priority_queue
#define vc vector
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define all(x) x.begin(),x.end()
#define CIN ios_base::sync_with_stdio(0); cin.tie(0)
#define loop0(i,n) for(int i=0;i<n;i++)
#define loop1(i,n) for(int i=1;i<=n;i++)
#define stlloop(x) for(__typeof(x.begin()) it=x.begin();it!=x.end();it++)
#define gcd(a, b) __gcd(a, b)
#define lcm(a, b) ((a)*((b)/gcd(a,b)))
#define case(z,x) cout<<"Case "<<i<<": "<<x<<endl
#define case(z) cout<<"Case "<<z<<": "
#define PI 3.14159265358979323846264338328
#define valid(tx,ty) tx>=0 && tx<r && ty>=0 && ty<c
#define MAX 2000
#define inf 10000000
/*------------------------------Graph Moves----------------------------*/
//const int fx[]={+1,-1,+0,+0};
//const int fy[]={+0,+0,+1,-1};
//const int fx[]={+0,+0,+1,-1,-1,+1,-1,+1}; // Kings Move
//const int fy[]={-1,+1,+0,+0,+1,+1,-1,-1}; // Kings Move
//const int fx[]={-2, -2, -1, -1, 1, 1, 2, 2}; // Knights Move
//const int fy[]={-1, 1, -2, 2, -2, 2, -1, 1}; // Knights Move
/*---------------------------------------------------------------------*/
using namespace std;
int m;
int bigmod(int a,int p)
{
if(p==0) return 1;
if(p%2==0)
{
return ((bigmod(a,p/2)%m)*(bigmod(a,p/2)%m))%m;
}
else
return ((a%m)*(bigmod(a,p-1)%m))%m;
}
int main()
{
CIN;
// freopen("in.txt","r",stdin);
// freopen("out.txt","w",stdout);
while(cin>>m)
{
int x=1,c=1;
while(x!=0)
{
x=(x*10)+1;
c++;
x=bigmod(x,1);
}
cout<<c<<endl;
}
return 0;
}
UVa – 374 – Bigmod
//#include <bits/stdc++.h>
//
//#define ms(a,b) memset(a,b,sizeof(a))
//#define pb(a) push_back(a)
//#define db double
//#define ft float
//#define ll long long
//#define ull unsigned long long
//#define ff first
//#define ss second
//#define sz(x) x.size()
//#define qu queue
//#define pqu priority_queue
//#define vc vector
//#define vi vector<int>
//#define vll vector<long long>
//#define pii pair<int,int>
//#define pis pair<int,string>
//#define psi pair<string,int>
//#define all(x) x.begin(),x.end()
//#define CIN ios_base::sync_with_stdio(0); cin.tie(0)
//#define loop0(i,n) for(int i=0;i<n;i++)
//#define loop1(i,n) for(int i=1;i<=n;i++)
//#define stlloop(x) for(__typeof(x.begin()) it=x.begin();it!=x.end();it++)
//#define gcd(a, b) __gcd(a, b)
//#define lcm(a, b) ((a)*((b)/gcd(a,b)))
//#define case(z,x) cout<<"Case "<<i<<": "<<x<<endl
//#define case(z) cout<<"Case "<<z<<": "
//#define PI 3.14159265358979323846264338328
//#define valid(tx,ty) tx>=0 && tx<r && ty>=0 && ty<c
//#define MAX 2000
//#define inf 10000000
//
///*----------------------Graph Moves----------------*/
////const int fx[]={+1,-1,+0,+0};
////const int fy[]={+0,+0,+1,-1};
////const int fx[]={+0,+0,+1,-1,-1,+1,-1,+1}; // Kings Move
////const int fy[]={-1,+1,+0,+0,+1,+1,-1,-1}; // Kings Move
////const int fx[]={-2, -2, -1, -1, 1, 1, 2, 2}; // Knights Move
////const int fy[]={-1, 1, -2, 2, -2, 2, -1, 1}; // Knights Move
///*------------------------------------------------*/
//
//using namespace std;
//
//ll big_mod(ll n, ll pow, ll mod)
//{
// if(pow==0) return 1;
// if(pow==1) return n;
//
// ll ret=0;
//
// if(pow%2==0)
// {
// ret=big_mod(n,pow/2,mod)%mod;
// return (ret*ret)%mod;
// }
// else
// return ((n%mod)*(big_mod(n,pow-1,mod))%mod)%mod;
//
//}
//
//int main()
//{
// CIN;
// //freopen("out.txt","w",stdout);
// ll a,b,c;
// cin>>a>>b>>c;
// cout<<big_mod(a,b,c)<<endl;
//// ll d=1;
//// for(int i=0;i<b;i++)
//// {
//// d*=a;
//// d%=c;
//// }
//// cout<<d<<endl;
//
// return 0;
//}
#include <bits/stdc++.h>
#define ms(a,b) memset(a,b,sizeof(a))
#define pb(a) push_back(a)
#define db double
#define ft float
#define ll long long
#define ull unsigned long long
#define ff first
#define ss second
#define sz(x) x.size()
#define qu queue
#define pqu priority_queue
#define vc vector
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define all(x) x.begin(),x.end()
#define CIN ios_base::sync_with_stdio(0); cin.tie(0)
#define loop0(i,n) for(int i=0;i<n;i++)
#define loop1(i,n) for(int i=1;i<=n;i++)
#define stlloop(x) for(__typeof(x.begin()) it=x.begin();it!=x.end();it++)
#define gcd(a, b) __gcd(a, b)
#define lcm(a, b) ((a)*((b)/gcd(a,b)))
#define case(z,x) cout<<"Case "<<i<<": "<<x<<endl
#define case(z) cout<<"Case "<<z<<": "
#define PI 3.14159265358979323846264338328
#define valid(tx,ty) tx>=0 && tx<r && ty>=0 && ty<c
#define MAX 2000
#define inf 10000000
/*----------------------Graph Moves----------------*/
//const int fx[]={+1,-1,+0,+0};
//const int fy[]={+0,+0,+1,-1};
//const int fx[]={+0,+0,+1,-1,-1,+1,-1,+1}; // Kings Move
//const int fy[]={-1,+1,+0,+0,+1,+1,-1,-1}; // Kings Move
//const int fx[]={-2, -2, -1, -1, 1, 1, 2, 2}; // Knights Move
//const int fy[]={-1, 1, -2, 2, -2, 2, -1, 1}; // Knights Move
/*------------------------------------------------*/
using namespace std;
ll a,b,m;
ll bigmod(ll n,ll p)
{
if(p==0) return 1;
if(p%2==0)
{
return ((bigmod(n,p/2)%m)*(bigmod(n,p/2)%m))%m;
}
else
return ((n%m)*(bigmod(n,p-1)%m))%m;
}
int main()
{
CIN;
freopen("in.txt","r",stdin);
freopen("out.txt","w",stdout);
while(cin>>a>>b>>m)
{
cout<<bigmod(a,b)<<endl;
}
return 0;
}
UVa – 458-The Decoder
#include <iostream>
#include <string>
using namespace std;
int main()
{
int i;
string s;
char a,b;
while(cin>>s)
{
for(i=0;s[i]!='\0';i++)
{
a=s[i];
b=a-7;
s[i]=b;
}
cout<<s<<endl;
}
return 0;
}
Fall out, Codes! 