Compilare: user.cpp: In function ‘void read()’: user.cpp:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void dijkstra(int)’: user.cpp:57: warning: comparison between signed and unsigned integer expressions user.cpp:80: warning: comparison between signed and unsigned integer expressions user.cpp:70: warning: label ‘label’ defined but not used user.cpp: In function ‘void make_new_graph()’: user.cpp:99: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void write()’: user.cpp:219: warning: comparison between signed and unsigned integer expressions