View Compilation Error

0_0_16479263_12726.cpp: In function 'int main()':
0_0_16479263_12726.cpp:19:4: error: expected '}' before 'else'
    else if(a[i]-a[i-1]<0)
    ^
0_0_16479263_12726.cpp:23:4: error: 'else' without a previous 'if'
    else{
    ^
0_0_16479263_12726.cpp: At global scope:
0_0_16479263_12726.cpp:46:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_16479263_12726.cpp:47:1: error: expected declaration before '}' token
 }
 ^