Borderou de evaluare (job #52912)

Compilare: user.cpp: In function ‘void backt(int, int)’: user.cpp:10:19: warning: unused variable ‘j’ [-Wunused-variable] user.cpp: In function ‘int main()’: user.cpp:35:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:36:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:37:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]