+// comparison
+#define EQ(x,y) ((x)==(y))
+#define GEQ(x,y) ((x)>=(y))
+#define GE(x,y) ((x)>(y))
+#define LEQ(x,y) ((x)<=(y))
+#define LE(x,y) ((x)<(y))
+
+// if_else
+#define if_else_f(x,y,z) (double)(((x)==0?(z):(y)))
+#define if_else_ll(x,y,z) (long long int)(((x)==0?(z):(y)))
+#define if_else_ul(x,y,z) (unsigned long long)(((x)==0?(z):(y)))
+#define if_else_u(x,y,z) (unsigned int)(((x)==0?(z):(y)))
+#define if_else_i(x,y,z) (int)(((x)==0?(z):(y)))
+