第十一題 UVa10696

#include<iostream>
using namespace std;

long f91(long number)
{
	if(number<=100)
		return f91(f91(number+11));
	else
		return number-10;
}

int main()
{
	long N;
	while(cin>>N)
	{
		if(N==0)
		break;
		cout<<"f91("<<N<<") = "<<f91(N)<<endl; 
	}
}

第十二題 UVa10783

#include<iostream>
using namespace std;

int main()
{
	int tc;
	cin>>tc;
	for(int test=1;test<=tc;test++)
	{
		int a,b,sum=0;
		cin>>a>>b;
		if(a%2==0)
		a++;
		if(b%2==0)
		b--;
		
		for(int i=a;i<=b;i+=2)
		{
			sum+=i;
		}
		cout<<"Case "<<test<<": "<<sum<<endl;
	}
}

第十三題 UVa10789

#include<iostream>
using namespace std;

bool is_prime(int num)
{
	int i;
	if(num==1)
		return false;
	else
	{
		for(i=2;i<num;i++)
		{
			if(num%i==0)
				return 0;
		}
	}
	return true;
}



int main()
{
	int tc;
	cin>>tc;
	for(int test=1;test<=tc;test++)
	{
		int frequency[123]={0};
		string word,ans="";
		cin>>word;
		for(int i=0;i<word.length();i++)
			frequency[word[i]]++;
		for(int i=48;i<58;i++)
		{
			if(is_prime(frequency[i])) 
				ans+=(char)i;
		}
		for(int i=65;i<91;i++)
		{
			if(is_prime(frequency[i])) 
				ans+=(char)i;
		}
		for(int i=97;i<123;i++)
		{
			if(is_prime(frequency[i])) 
				ans+=(char)i;
		}
		if(ans=="")
			cout<<"Case "<<test<<": empty"<<endl;
		else
			cout<<"Case "<<test<<": "<<ans<<endl;
	}
}

第十四題 UVa10812

#include<iostream>
#include<cmath>
using namespace std;

int main()
{
	int tc;
	cin>>tc;
	while(tc--)
	{
		int a,b,sum,diff;
		cin>>sum>>diff;
		a=(sum+diff)/2;
		b=sum-a;
		if(a<0||b<0||(a+b)!=sum||(abs(a-b))!=diff)
		cout<<"impossible"<<endl;
		else if(a>b)
		cout<<a<<" "<<b<<endl;
		else
		cout<<b<<" "<<a<<endl;
	}
}

第十五題 UVa10878

#include<iostream>
#include<string>
using namespace std;

int main()
{
	string word;
	while(getline(cin,word))
	{
		if(word[0]=='_')
			continue;
		char c=0;
		for(int i=1;i<word.length()-1;i++)
		{
			if(word[i]=='o')
				c=c*2+1;
			else if(word[i]==' ')
				c*=2;
		}
		cout<<c;	  
	}
}