Compilare: user.cpp: In function ‘void read()’: user.cpp:32: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int dijk(int, int)’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:76: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int dijk(int, int)’: user.cpp:41: warning: ‘z’ may be used uninitialized in this function