Eroare de compilare: user.cpp: In function ‘void citire()’: user.cpp:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DF(int)’: user.cpp:105: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void tipar()’: user.cpp:111: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result /usr/bin/ld: cannot open output file user: No such file or directory collect2: ld returned 1 exit status