AOJ を俺が解くとこうなる Volume 0 【C++】

QQ

#include<iostream>
using namespace std;

int main()
{
 for(int i=1;i<=9;++i)
 {
  for(int j=1;j<=9;++j)
  {
   printf("%dx%d=%d\n" , i , j , i*j);
  }
 }
    return 0;
}

List of Top 3 Hills

#include<iostream>
#define element 10

using namespace std;

int height[element];
int number;
int main()
{
 for(int i=0;i<element;++i)
 {
  cin >> height[i];
 }
 for(int i=0;i<element;++i)
 {
  for(int j=i;j<element;++j)
  {
   if(height[i]<height[j])
   {
    number = height[i];
    height[i] = height[j];
    height[j] = number;
   }
  }
 }
 printf("%d\n%d\n%d\n",height[0],height[1],height[2]);
 return 0;
}

Digit Number

#include<iostream>

int a, b, n, m;

int main()
{
 while(std::cin>>a>>b)
 {
  n = a + b;
  m = 1;
  while(n>=10)
  {
   n=n/10;
   ++m;
  }
  printf ("%d\n",m);
 }
 return 0;
}

Is it a Right Triangle?

#include<iostream>

unsigned short a, b, c;
int m;
bool flag;

int main()
{
 std::cin >> m;
 for(int i = 0;i < m;++i)
 {
  std::cin >> a >> b >> c;
  if (a==0||b==0||c==0)
  {
   continue;
  }

  flag = false;
  if((a*a)+(b*b)==(c*c))
  {
   flag = true;
  }
  else if((a*a)+(c*c)==(b*b))
  {
   flag = true;
  }
  else if((b*b)+(c*c)==(a*a))
  {
   flag = true;
  }
  if(flag==false)
  {
   printf("NO\n");
  }
  else
  {
   printf("YES\n");
  }
 }
 return 0;
}

Simultaneous Equation

#include<iostream>
#include<math.h>

double a, b, c, d, e, f;
int main()
{
 while(std::cin>>a>>b>>c>>d>>e>>f)
 {
  double x = (e*c-b*f)/(a*e-b*d);
  double y = (-d*c+a*f)/(a*e-b*d);
  printf("%.3lf %.3lf\n",x+(1e-10),y+(1e-10));
 }
 return 0;
}

GCD and LCM

#include<iostream>

using namespace std;

int a, b;
int change;
int GCD(int m, int n)
{
 if((0==m)||(0==n))
 {
  return 0;
 }
 while(m!=n)
 {
  if(m>n)
  {
   m=m-n;
  }
  else
  {
   n=n-m;
  }
 }
 return m;
}
int LCM(int m,int n)
{
 if((0==m)||(0==n))
 {
  return 0;
 }
 return m/GCD(m,n)*n;
}
int main()
{
 while(cin>>a>>b)
 {
  printf("%d %d\n",GCD(a,b),LCM(a,b));
 }
}

Reverse Sequence

#include<iostream>

using namespace std;

char str[20];

int main()
{
 cin>>str;
 for(int i=0;i<20;++i)
 {
  if(str[19-i]!=0)
  {
   printf("%c",str[19-i]);
  }
 }
 printf("\n");

}

Debt Hell

#include<iostream>

using namespace std;

double money = 100000;

int i;

int main()
{
 cin>>i;
 for(i;i>0;--i)
 {
  money *= 1.05;
  money = (long)(money/1000+0.99)*1000;
 }
 printf("%.0lf\n",money);
}

Sum of 4 Integers

#include<iostream>
 
using namespace std;
 
int n;
int count;
 
int main()
{
    while(cin>>n)
    {
        for(int i=0;i<=9;++i)
        {
            for(int j=0;j<=9;++j)
            {
                for(int k=0;k<=9;++k)
                {
                    for(int l=0;l<=9;++l)
                    {
                        if(i+j+k+l==n)
                        {
                            ++count;
                        }
                    }
                }
            }
        }
        cout<<count<<endl;
        count = 0;
    }
}

Prime Number

#include<iostream>

using namespace std;

int main()
{
 int n;
 while(cin>>n)
 {
  int count = 0;
  bool *flag = new bool[n+1]();
  for(int i=2;i<=n;++i)
  {
   if (flag[i])
   {
    continue;
   }
   for(int j=i*2;j<=n;j+=i)
   {
    flag[j] = true;
   }
  }
  flag[0]=true;
  flag[1]=true;
  for(int i=0;i<=n;++i)
  {
   if(!flag[i])
   {
    ++count;
   }
  }
  cout<<count<<endl;
 }
}