View Compilation Error

0_0_38249086_7312.cpp: In function 'int main()':
0_0_38249086_7312.cpp:26:5: error: expected '}' before 'else'
     else
     ^
0_0_38249086_7312.cpp:27:10: error: 's' was not declared in this scope
     sum+=s;//不足下一次，就直接加上 
          ^
0_0_38249086_7312.cpp:31:9: error: 'sum' was not declared in this scope
   cout<<sum<<endl;
         ^
0_0_38249086_7312.cpp: At global scope:
0_0_38249086_7312.cpp:33:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_38249086_7312.cpp:34:1: error: expected declaration before '}' token
 }
 ^