View Compilation Error

0_0_35235600_8088.cpp: In function 'int main()':
0_0_35235600_8088.cpp:51:5: error: expected '}' before 'else'
     else {
     ^
0_0_35235600_8088.cpp:57:25: error: 'sumX' was not declared in this scope
       if(sum(mid+1)-k < sumX) begin = mid + 1;
                         ^
0_0_35235600_8088.cpp: At global scope:
0_0_35235600_8088.cpp:66:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_35235600_8088.cpp:67:1: error: expected declaration before '}' token
 }
 ^