View Compilation Error

0_0_27898084_26934.cpp: In function 'int solve()':
0_0_27898084_26934.cpp:18:8: error: 'inf' was not declared in this scope
   b[i]=inf;
        ^
0_0_27898084_26934.cpp:23:17: error: 'smax' was not declared in this scope
   smax(ans, id+1);
                 ^