Compilare: user.cpp: In function 'void solve()': user.cpp:109: warning: comparison between signed and unsigned integer expressions user.cpp:119: warning: 'nod' may be used uninitialized in this function /tmp/ccPNwxZB.o: In function `read()': user.cpp:(.text+0x50f): warning: the `gets' function is dangerous and should not be used.