View Compilation Error

0_0_37354631_1522.cpp: In function 'void doWork()':
0_0_37354631_1522.cpp:63:10: error: invalid initialization of non-const reference of type 'int&' from an rvalue of type 'int'
     dfs(1);
          ^
0_0_37354631_1522.cpp:22:6: note: in passing argument 1 of 'void dfs(int&)'
 void dfs(int &node) {
      ^