View Compilation Error

0_0_18496302_11976.cpp: In function 'long long int dfs(int, int, int, bool, bool)':
0_0_18496302_11976.cpp:23:13: error: 'else' without a previous 'if'
             else{
             ^
0_0_18496302_11976.cpp: At global scope:
0_0_18496302_11976.cpp:30:5: error: expected unqualified-id before 'if'
     if(flag)dp[pos][pre][len]=ans;
     ^
0_0_18496302_11976.cpp:31:5: error: expected unqualified-id before 'return'
     return ans;
     ^
0_0_18496302_11976.cpp:32:1: error: expected declaration before '}' token
 }
 ^