View Compilation Error

0_0_30363348_20816.cpp: In function 'int main()':
0_0_30363348_20816.cpp:75:9: error: 'inf' was not declared in this scope
   LL l=-inf,r=inf;
         ^
0_0_30363348_20816.cpp:76:11: error: 'r' was not declared in this scope
   while(l<r)
           ^
0_0_30363348_20816.cpp:82:19: error: 'r' was not declared in this scope
   printf("%lld\n",r);
                   ^