#include<stdio.h>
int main()
{
int a,b,c,m,n,f=0,t=0,o=2,j=2,s=0,r=0;
int x[105],y[105];
scanf("%d %d %d",&a,&b,&c);
for(int i=0;i<c;i++)
{
scanf("%d %d",&f,&t);
if(f==0)
{
x[o++]=t;
}
else
{
y[j++]=t;
}
}
for(int i=0;i<o;i++)
{
for(int p=i+1;p<o;p++)
{
if(x[i]>x[p])
{
c=x[i];
x[i]=x[p];
x[p]=c;
}
}
}
for(int i=1;i<o;i++)
{
if(s<x[i]-x[i-1])
{
s=x[i]-x[i-1];
}
}
for(int i=0;i<j;i++)
{
for(int p=i+1;p<j;p++)
{
if(x[i]>x[p])
{
c=x[i];
x[i]=x[p];
x[p]=c;
}
}
}
for(int i=1;i<j;i++)
{
if(r<x[i]-x[i-1])
{
r=x[i]-x[i-1];
}
}
printf("%d\n",s);
}
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