prog.c: In function ‘main’:
prog.c:6:6: error: ‘i’ undeclared (first use in this function)
for(i=1;i<=t;i++)
^
prog.c:6:6: note: each undeclared identifier is reported only once for each function it appears in
prog.c:28:3: warning: implicit declaration of function ‘printnf’ [-Wimplicit-function-declaration]
printnf("%d\n",sol);
^~~~~~~