View Compilation Error

0_0_30293412_9981.cpp: In function 'int main()':
0_0_30293412_9981.cpp:25:9: error: 'else' without a previous 'if'
         else{
         ^
0_0_30293412_9981.cpp:28:27: error: 'n' was not declared in this scope
             for(int i=1;i<n;i++){
                           ^
0_0_30293412_9981.cpp: At global scope:
0_0_30293412_9981.cpp:46:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_30293412_9981.cpp:47:1: error: expected declaration before '}' token
 }
 ^