View Compilation Error

0_0_35970848_26372.cpp: In function 'int main()':
0_0_35970848_26372.cpp:24:13: error: 'inf' was not declared in this scope
   memset(dp,inf,sizeof(dp));
             ^
0_0_35970848_26372.cpp:31:4: error: 'll' was not declared in this scope
    ll dis=0;
    ^
0_0_35970848_26372.cpp:34:5: error: 'dis' was not declared in this scope
     dis=dis+(long long)(i-j)*(p[j+1].x-p[j].x);
     ^