Compilare: user.cpp: In function ‘void read()’: user.cpp:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void dfs(int)’: user.cpp:41: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void get_edges(int, int)’: user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void compact_str_con()’: user.cpp:80: warning: comparison between signed and unsigned integer expressions user.cpp:81: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void insert(int)’: user.cpp:96: warning: comparison between signed and unsigned integer expressions user.cpp:98: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void sort_and_get_vals()’: user.cpp:109: warning: comparison between signed and unsigned integer expressions user.cpp:113: warning: comparison between signed and unsigned integer expressions user.cpp:117: warning: comparison between signed and unsigned integer expressions