A – Hashmat the Brave Warrior
```#include <stdio.h>
#include <stdlib.h>
int main()
{
unsigned long long a,b;
while(scanf("%llu%llu",&a,&b)!=EOF)
{
if(a>=b)
printf("%llu\n",a-b);```
```       else
printf("%llu\n",b-a);
}
return 0;
}```
B – Back to High School Physics
```#include <stdio.h>
int main()
{
int a,b;
while(scanf("%d%d",&a,&b)!=EOF)
{
printf("%d\n",2*a*b);
}
return 0;
}```
```#include <stdio.h>
int main()
{
int T,n,i,j,a,b,c,sum;
scanf("%d",&T);
for(i=0;i<T;i++)
{
scanf("%d",&n);
sum=0;
for(j=0;j<n;j++)
{
scanf("%d%d%d",&a,&b,&c);
sum+=a*c;
}
printf("%d\n",sum);
}
return 0;
}```
D – The Decoder
```#include <stdio.h>
#include <string.h>
int main()
{
int n,i;
char charater[1000]={''};
while(scanf("%s",charater)!=EOF)
{
n=strlen(charater);
for(i=0;i<n;i++)
charater[i]-=7;
puts(charater);
for(i=0;i<n;i++)
charater[i]='';
}
return 0;
}```
E – Kindergarten Counting Game
```#include <stdio.h>
#include <string.h>
int main()
{
int i,n,count;
char c[1000]={''};
while(fgets(c,1000, stdin))
{
count=0;
n=strlen(c);
for(i=0;i<n;i++)
{
if(((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))&&(c[i+1]<'A'```
```                   ||(c[i+1]>'Z'&&c[i+1]<'a')||c[i+1]>'z'))
{
count++;
}
}
printf("%d\n",count);
memset(c,0,sizeof(char)*1000);
count=0;
}
return 0;
}```
F – Machined Surfaces
```#include<stdio.h>
#include<string.h>
int main()
{
char arr[25][25];
int i,j,arr2[25],max,sum;
unsigned int N;
while(scanf("%d",&N)==1,N) {

memset(arr2,0,sizeof(arr2));
sum=0;
for(i=0;i<N;i++) {
for(j=0;j<25;j++)
scanf("%c",&arr[i][j]);
getchar();
}
for(i=0;i<N;i++)
for(j=0;j<25;j++)
if(arr[i][j]=='X')
arr2[i]++;

max=arr2[0];
for(i=0;i<N;i++)
if(arr2[i]>max)
max=arr2[i];

for(i=0;i<N;i++)
sum+=(max-arr2[i]);
printf("%d\n",sum);
}
return 0;
}```