View Compilation Error

0_0_4072324_23163.cpp:5: error: `main' must return `int'
0_0_4072324_23163.cpp:30: error: `main' must return `int'
0_0_4072324_23163.cpp: In function `int main(...)':
0_0_4072324_23163.cpp:30: error: redefinition of `int main(...)'
0_0_4072324_23163.cpp:5: error: `int main(...)' previously defined here