View Compilation Error

0_0_14567941_26013.cpp: In function 'bool dfs(int)':
0_0_14567941_26013.cpp:3:5: error: 'vector' was not declared in this scope
     vector<int>::iterator i=v[u].begin();
     ^
0_0_14567941_26013.cpp:3:12: error: expected primary-expression before 'int'
     vector<int>::iterator i=v[u].begin();
            ^
0_0_14567941_26013.cpp:4:10: error: 'i' was not declared in this scope
     for(;i!=v[u].end();i++)
          ^
0_0_14567941_26013.cpp:4:13: error: 'v' was not declared in this scope
     for(;i!=v[u].end();i++)
             ^
0_0_14567941_26013.cpp:7:13: error: 'vis' was not declared in this scope
         if(!vis[v])
             ^
0_0_14567941_26013.cpp:10:16: error: 'match' was not declared in this scope
             if(match[v]==-1||dfs(v))
                ^