View Compilation Error

0_0_37164425_21949.cpp: In function 'int main()':
0_0_37164425_21949.cpp:22:5: error: redefinition of 'int main()'
 int main(){
     ^
0_0_37164425_21949.cpp:12:5: note: 'int main()' previously defined here
 int main(void)
     ^