Compilare: user.cpp: In function ‘void init()’: user.cpp:22:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, a, b; ^ user.cpp: In function ‘void solve()’: user.cpp:35:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, a, b, k; ^ user.cpp: In function ‘void read()’: user.cpp:17:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^