View Compilation Error

0_0_30762935_25916.cpp: In function 'int dfs(int, int, int)':
0_0_30762935_25916.cpp:15:9: error: redeclaration of 'int flag'
     int flag=G[now].size()-1;
         ^
0_0_30762935_25916.cpp:10:9: note: 'int flag' previously declared here
     int flag=0;
         ^