Compilare: user.cpp: In function ‘int Search(int)’: user.cpp:10: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void insert(int)’: user.cpp:19: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void del(int)’: user.cpp:28: warning: comparison between signed and unsigned integer expressions user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp:27: warning: unused variable ‘d’ user.cpp: In function ‘int main()’: user.cpp:46: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result