View Compilation Error

0_0_29955252_31372.cpp: In function 'int main()':
0_0_29955252_31372.cpp:15:13: error: 'ans' was not declared in this scope
             ans = max(ans, 1.0 * (sum + s[i]) / v[i]);
             ^
0_0_29955252_31372.cpp:17:26: error: 'ans' was not declared in this scope
         printf("%.9lf\n",ans);
                          ^