Compilare: user.cpp: In function 'void i1()': user.cpp:54: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void read_solve()': user.cpp:71: warning: format '%s' expects type 'char*', but argument 2 has type 'char (*)[10000000]' user.cpp:71: warning: format '%s' expects type 'char*', but argument 3 has type 'char (*)[10000000]'