View Compilation Error

0_0_23809213_13989.cpp:3:1: error: expected ',' or ';' before 'using'
 using namespace std;  
 ^
0_0_23809213_13989.cpp: In function 'void dfs(int, int)':
0_0_23809213_13989.cpp:22:44: error: 'min' was not declared in this scope
         dp[fa] += min(dp[son], edge[i].cost);  
                                            ^
0_0_23809213_13989.cpp:22:44: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_23809213_13989.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3444:5: note:   'std::min'
     min(initializer_list<_Tp> __l, _Compare __comp)
     ^