#include <iostream>
using namespace std;
int main() {
int t,n,c,q,l,r;
scanf("%d",&t);
while(t)
{
scanf("%d%d%d",&n,&c,&q);
while(q)
{
scanf("%d%d",&l,&r);
/* if(c==l)
c=r;
else
{
if(c==r)
c=l;
else
if(
c=r-(c-l);
}*/
if(c>=l&&c<=r)
c=r-(c-l);
q--;
}
printf("%d\n",c);
t--;
}
return 0;
}
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