Compilare: user.cpp: In function ‘void prepare(int)’: user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void read()’: user.cpp:95: warning: comparison between signed and unsigned integer expressions user.cpp:84: warning: unused variable ‘it’ user.cpp: In function ‘int bellman()’: user.cpp:165: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:196: warning: unused variable ‘i’ user.cpp: In function ‘int bellman()’: user.cpp:190: warning: ‘mn’ may be used uninitialized in this function