Compilare: user.cpp: In function ‘void read()’: user.cpp:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int Search(int)’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS(int, int)’: user.cpp:85: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void write()’: user.cpp:98: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long int’