Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:68: warning: comparison between signed and unsigned integer expressions user.cpp:51: warning: unused variable ‘sz’ user.cpp: In function ‘void read()’: user.cpp:84: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:85: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:94: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:102: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result