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reaction.c
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#include <stdio.h>
#include <stdlib.h>
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
int r,c;
scanf("%d %d",&r,&c);
int a[10][10];
int flag=1;
int i,j;
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
scanf("%d",&a[i][j]);
if(a[i][j]>=4)
{
flag=0;
}
else if((i==0 || i==r-1) && j>0 && j<c-1 && a[i][j]>=3)
{
flag=0;
}
else if((j==0 || j==c-1) && i>0 && i<r-1 && a[i][j]>=3)
{
flag=0;
}
else if((j==0 || j==c-1) && (i==0 || i==r-1) && a[i][j]>=2)
{
flag=0;
}
}
}
if(flag==1)
{
printf("Stable\n");
}
else
{
printf("Unstable\n");
}
}
return 0;
}