View Compilation Error

0_0_18050834_31380.cpp: In function 'int bin(long long int)':
0_0_18050834_31380.cpp:19:12: error: 'sum' was not declared in this scope
         if(sum[mid] == x)  
            ^
0_0_18050834_31380.cpp: In function 'int main()':
0_0_18050834_31380.cpp:65:40: error: 'bisearch' was not declared in this scope
                     if(bisearch(ss-c[i]) >= 0)
                                        ^