nile.cpp: In function 'int main()':
nile.cpp:34:12: warning: ignoring return value of 'int system(const char*)' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | system ("code.exe");
| ~~~~~~~^~~~~~~~~~~~
nile.cpp:35:12: warning: ignoring return value of 'int system(const char*)' declared with attribute 'warn_unused_result' [-Wunused-result]
35 | system ("codew.exe");
| ~~~~~~~^~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccM22MVD.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccxP7mDv.o:nile.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccM22MVD.o: in function `main':
grader.cpp:(.text.startup+0x30e): undefined reference to `calculate_costs(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status