View Compilation Error

0_0_37579650_28441.cpp: In function 'int main()':
0_0_37579650_28441.cpp:46:11: error: expected initializer before 'len'
   int ans len;
           ^
0_0_37579650_28441.cpp:55:5: error: 'ans' was not declared in this scope
     ans = i / 2;
     ^
0_0_37579650_28441.cpp:59:23: error: 'ans' was not declared in this scope
   for(int i = 1; i <= ans; i ++) cout << s1[i];
                       ^
0_0_37579650_28441.cpp:60:23: error: 'ans' was not declared in this scope
   for(int i = 1; i <= ans; i ++) cout << s2[i];
                       ^