using namespace std;

int main(){
	int n,flag=1;
	cin>>n;
	int ge=n%10;
	n/=10;
	while(n>0){
		if(ge<=n%10){
			flag=0;
			break;
		}
		ge=n/=10;
		n/=10;
			
	}
	if(flag) cout<<"yes";
	else cout<<"no";
	return 0;
}

using namespace std;
int main(){

	int a,b,i;
	cout<<"0.";
	i=1;
	a=1;
	while(i<100){
		a*=10;
		b=a/7;
		cout<<b;
		a%=7;
		i++;
	}

	return 0;
}

#include using namespace std;

int main(){ int a,b,i; cout<<"0."; i=1; a=1; while(i<=100){ a*=10; b=a/7; cout<<b; a%=7; i++; } cout<<"各个数为上的数字之和是:"<<m;

return 0;

}

using namespace std;

int main(){
	int n,m=0;
	cout<<"请输入一个非负整数："; 
	cin>>n;
	while(n!=0){
		m+=n%10;
		n/=10;
	} 
	cout<<"各个数为上的数字之和是："<<m; 
	return 0;
}



```
`

using namespace std;

int main(){
	int n,m=0;
	cout<<"请输入一个非负整数";
	cin>>n;
	while(n!=0){
		m+=n%10;
		n/=10;
	} 
	cout<<"各个数为上的数字之和是:"<<m; 

	return 0;
}

using namespace std;

int main(){
	long long n,s=0;
	cout<<"n=";
	cin>>n;
	while(n!=1){
		cout<<n<<"-->";
		if(n%2==1){
			n=n*3+1;
		}else{
			n/=2;
		}
		s++;
		cout<<n<<endl;
	} 
	return 0;
}

`

using namespace std;

int main(){ long long n,s=0; cout<<"n="; cin>>n; while(n!=1){ cout<<n<<"-->"; if(n%2==1){ n=n*3+1; }else{ n/=2; } s++; cout<<n<<endl; } return 0; }

`

using namespace std;

int main(){
	int x,y,s,i=1;
	cout<<"请输入两个正整数:";
	cin>>x>>y;
	if(x>y){
		swap(x,y);
	} 
	s=y*i;
	while(s%x!=0){
		i++;
		s=y*i;
	}
	cout<<"再见"<<s<<"天又在图书馆相会" <<endl;

	return 0;
}

using namespace std;

int main(){ int a,b,c; cin>>a>>b; int a1=a,b1=b; c=a%b; while(c>0){ a=b; b=c; c=a%b; } printf("%d和%d的最大公约数是:%d",a1,b1,b);

return 0;

}

using namespace std;

int main(){
int	a,b,c;
	cin>>a>>b;
	int a1=a,b1=b;
	c=a%b;
	while(c>0){
		a=b;
		b=c;
		c=a%b;
	}
	printf("%d和%d的最大公约数是:%d",a1,b1,b);

	return 0;
}


```