Eroare de compilare: user.cpp: In function ‘void backtrack(int&, int&)’: user.cpp:36:40: error: invalid initialization of non-const reference of type ‘int&’ from an rvalue of type ‘int’ if(pos<n) backtrack(pos+1,i+1); ^ user.cpp:24:6: error: in passing argument 1 of ‘void backtrack(int&, int&)’ void backtrack(int &pos,int &rr) ^ user.cpp: In function ‘int main()’: user.cpp:60:18: error: invalid initialization of non-const reference of type ‘int&’ from an rvalue of type ‘int’ backtrack(1,1); ^ user.cpp:24:6: error: in passing argument 1 of ‘void backtrack(int&, int&)’ void backtrack(int &pos,int &rr) ^ user.cpp:56:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("damesah.in","r",stdin); ^ user.cpp:57:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("damesah.out","w",stdout); ^ user.cpp:58:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^