Compilare: user.cpp: In function ‘void readinput()’: user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp:15: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void go(unsigned int)’: user.cpp:32: warning: comparison between signed and unsigned integer expressions user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void writeoutput()’: user.cpp:54: warning: comparison between signed and unsigned integer expressions user.cpp:60: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result