Eroare de compilare: /tmp/ccWqNAtw.o: In function `backtrack(int, int)': user.cpp:(.text+0x182): undefined reference to `mod(long long)' /tmp/ccWqNAtw.o: In function `main': user.cpp:(.text.startup+0xfc): undefined reference to `mod(long long)' user.cpp:(.text.startup+0x167): undefined reference to `mod(long long)' user.cpp:(.text.startup+0x18a): undefined reference to `mod(long long)' user.cpp:(.text.startup+0x213): undefined reference to `mod(long long)' /tmp/ccWqNAtw.o:user.cpp:(.text.startup+0x29a): more undefined references to `mod(long long)' follow collect2: error: ld returned 1 exit status