Compilare: user.cpp: In function ‘void scan()’: user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void deque()’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:39: warning: unused variable ‘w’ user.cpp: In function ‘int main()’: user.cpp:79: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:80: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void deque()’: user.cpp:40: warning: ‘sf’ may be used uninitialized in this function user.cpp:40: warning: ‘inc’ may be used uninitialized in this function