View Compilation Error

0_0_2133516_20877.cpp: In function `int main()':
0_0_2133516_20877.cpp:5: error: conflicting declaration 'int a[100000000]'
0_0_2133516_20877.cpp:5: error: 'a' has a previous declaration as `int a'
0_0_2133516_20877.cpp:5: error: declaration of `int a[100000000]'
0_0_2133516_20877.cpp:5: error: conflicts with previous declaration `int a'
0_0_2133516_20877.cpp: In function `int f(int)':
0_0_2133516_20877.cpp:12: error: `a' undeclared (first use this function)
0_0_2133516_20877.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2133516_20877.cpp: At global scope:
0_0_2133516_20877.cpp:25: error: expected declaration before '}' token