View Compilation Error

0_0_28170888_15892.cpp: In function 'void dfs(int, int)':
0_0_28170888_15892.cpp:5:14: error: 'ans' was not declared in this scope
     if(l==0){ans = min(ans,r);return;)
              ^
0_0_28170888_15892.cpp:5:38: error: expected primary-expression before ')' token
     if(l==0){ans = min(ans,r);return;)
                                      ^
0_0_28170888_15892.cpp:13:1: error: a function-definition is not allowed here before '{' token
 {
 ^
0_0_28170888_15892.cpp:21:1: error: expected '}' at end of input
 }
 ^