View Compilation Error

0_0_32263649_21982.cpp: In function 'void dfs(int, int, int, int)':
0_0_32263649_21982.cpp:14:35: error: 'max' was not declared in this scope
     if(a==amount) {maxv=max(maxv,v);return;}
                                   ^
0_0_32263649_21982.cpp: In function 'int main()':
0_0_32263649_21982.cpp:30:5: error: 'cin' was not declared in this scope
     cin>>T;
     ^
0_0_32263649_21982.cpp:34:33: error: 'memset' was not declared in this scope
         memset(vis,0,sizeof(vis));
                                 ^
0_0_32263649_21982.cpp:45:9: error: 'cout' was not declared in this scope
         cout<<maxv<<endl;
         ^
0_0_32263649_21982.cpp:45:21: error: 'endl' was not declared in this scope
         cout<<maxv<<endl;
                     ^