View Compilation Error

0_0_36694367_12021.cpp: In function 'int main()':
0_0_36694367_12021.cpp:68:5: error: redefinition of 'int main()'
 int main() {
     ^
0_0_36694367_12021.cpp:18:5: note: 'int main()' previously defined here
 int main() {
     ^