Compilare: user.cpp: In function ‘bool check(int)’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void out(int)’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void in(int)’: user.cpp:57: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int nextInt()’: user.cpp:69: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:72: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:77: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:86: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:88: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result