View Compilation Error

0_0_33694720_21724.cpp:7:1: error: expected initializer before 'map'
 map<ll,int>m;
 ^
0_0_33694720_21724.cpp: In function 'void f(ll, ll)':
0_0_33694720_21724.cpp:14:8: error: 'm' was not declared in this scope
     if(m[sum]) return;
        ^
0_0_33694720_21724.cpp: In function 'int main()':
0_0_33694720_21724.cpp:24:30: error: 'b' was not declared in this scope
         scanf("%lld%lld",&a,&b);
                              ^