View Compilation Error

0_0_25721335_2232.cpp: In function 'int main()':
0_0_25721335_2232.cpp:152:5: error: redefinition of 'int main()'
 int main()
     ^
0_0_25721335_2232.cpp:21:5: note: 'int main()' previously defined here
 int main() {
     ^