View Compilation Error

0_0_37517902_22525.cpp: In function 'int main()':
0_0_37517902_22525.cpp:82:9: error: 'Begin' was not declared in this scope
         Begin.first = 2 * x;
         ^
0_0_37517902_22525.cpp:101:9: error: 'End' was not declared in this scope
         End.first = 2 * x;
         ^