View Compilation Error

0_0_34359747_8716.cpp: In function 'int main()':
0_0_34359747_8716.cpp:20:9: error: 'a' was not declared in this scope
    cin>>a[i].begin_>>a[i].end_;
         ^
0_0_34359747_8716.cpp:22:14: error: 'a' was not declared in this scope
   temp_end = a[0].end_;
              ^
0_0_34359747_8716.cpp:25:40: error: 'temp' was not declared in this scope
    if(a[i].end_>temp_end&&a[i].begin_>=temp.end_)
                                        ^