Compilare: user.cpp: In function ‘void df(int)’: user.cpp:47: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:59: warning: format ‘%s’ expects type ‘char*’, but argument 2 has type ‘char (*)[1001]’ user.cpp:81: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long long unsigned int’ user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result