View Compilation Error

0_0_30268838_18034.cpp: In function 'void dfs(int, int)':
0_0_30268838_18034.cpp:11:2: error: 's' was not declared in this scope
  s[uu]=1;
  ^
0_0_30268838_18034.cpp:14:7: error: 'son' was not declared in this scope
   dfs(son,uu);
       ^
0_0_30268838_18034.cpp: At global scope:
0_0_30268838_18034.cpp:18:1: error: expected declaration before '}' token
 }
 ^