Borderou de evaluare (job #271102)

Compilare: user.cpp: In function ‘void backtracking(int)’: user.cpp:15:14: warning: unused variable ‘a’ [-Wunused-variable] user.cpp: In function ‘int main()’: user.cpp:41:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:42:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:43:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]