Compilare: user.cpp: In function ‘int solve(int, int, int)’: user.cpp:29:29: warning: unused variable ‘idx’ [-Wunused-variable] int tenM[32], tenK[32], idx = 0, exp10_lg, x, y, lg = 0; ^ user.cpp:30:24: warning: unused variable ‘digit’ [-Wunused-variable] int i, a, b, c, d, digit, r1, r2; ^ user.cpp:29:38: warning: ‘exp10_lg’ may be used uninitialized in this function [-Wmaybe-uninitialized] int tenM[32], tenK[32], idx = 0, exp10_lg, x, y, lg = 0; ^