View Compilation Error

0_0_9918592_22889.cpp:45: error: `main' must return `int'
0_0_9918592_22889.cpp: In function `int main(...)':
0_0_9918592_22889.cpp:51: error: invalid conversion from `long long int (*)(const void*, const void*)' to `int (*)(const void*, const void*)'
0_0_9918592_22889.cpp:51: error:   initializing argument 4 of `void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'