鸡与兔同笼

#include <stdio.h>

int main()

{

int m,n,x,y;

while (scanf("%d%d",&n,&m)!=EOF)

{

x=(4*n-m)/2;

y=(m-2*n)/2;

if(x+y==n&&y>=0&&x>=0)

printf("%d %d\n",x,y);

else

printf("no answer\n");

}

return 0;

}