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:58: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DF(int)’: user.cpp:104: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void tipar()’: user.cpp:110: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result