#include<stdio.h>
void?pyramid(int?n);//聲明?
int?main?()
{
int?n;?
scanf("%d",&n);
pyramid(n);
return?0;
}
void?pyramid(int?n)
{
int?i,j,k;
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
{
printf("?");
}
for(k=1;k<=i;k++)
{
printf("%-2d",i);
}printf("\n");

}
}

#include<stdio.h>
#include<math.h>
double?fun(double?x);//聲明?
int?main?()
{
double?x;
scanf("%lf",&x);
printf("%.5lf\n",fun(x));
return?0;
}
double?fun(double?x)
{
double?y;
if(x<1)
y=x;
else?if(x>=1&&x<10)
y=pow(2*x-1,0.5);
else
y=log(3*x);
return?y;
}

#include<stdio.h>
double?mypow(double?x,int?n);//聲明?
int?main?()
{
double?x;
int?n;
scanf("%lf?%d",&x,&n);
printf("%.5lf\n",mypow(x,n));
return?0;
}
double?mypow(double?x,int?n)
{
int?i;
double?sum=1;
for(i=1;i<=n;i++)
{
sum=x*sum;
}
return?sum;
}

#include<stdio.h>
int?fun(int?n);
int?main()
{
int?n;
scanf("%d",&n);
printf("%d\n",fun(n));
return?0;
}
int?fun(int?n)
{
int?m,i;
????m=n-1;
????for(m=m;m>2;m--)
????{
????????for(i=2;i<=m/2;i++)
????????????if(m%i==0)
????????????????break;
????????????if(i>=m/2&&m!=1){
????????????n=m;
break;
????????}
????}
}

#include<stdio.h>
int?fn(int?a,int?n);
int?SumA(int?a,int?n);
int?main()
{
????int?a,n;
scanf("%d%d",&a,&n);
printf("fn(%d,%d)=%d\n",a,n,fn(a,n));
printf("s=%d\n",SumA(a,n));
return?0;
}
int?fn(int?a,int?n)
{
int?i,sum=0;
for(i=1;i<=n;i++){
sum=sum*10+a;
}
return?sum;
}
int?SumA(int?a,int?n)
{
int?j,s=0,sum=0;
for(j=1;j<=n;j++){
s=s*10+a;
sum+=s;
}
return?sum;
}