Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:82:17: warning: unused variable ‘nr0’ [-Wunused-variable] int nr0 = 0, len = 0, j = i; ^ user.cpp:82:26: warning: unused variable ‘len’ [-Wunused-variable] int nr0 = 0, len = 0, j = i; ^ user.cpp:82:35: warning: unused variable ‘j’ [-Wunused-variable] int nr0 = 0, len = 0, j = i; ^ user.cpp: In function ‘int main()’: user.cpp:93:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", a + 1); ^