View Compilation Error

0_0_17052415_471.cpp: In function 'void dfs(int)':
0_0_17052415_471.cpp:20:15: error: 'else' without a previous 'if'
             } else i++;
               ^
0_0_17052415_471.cpp: At global scope:
0_0_17052415_471.cpp:33:1: error: expected declaration before '}' token
 }
 ^