Compilare: user.cpp: In function ‘void solve()’: user.cpp:87:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, x; ^ user.cpp:87:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, x; ^ user.cpp:87:18: warning: unused variable ‘x’ [-Wunused-variable] int i, j, k, x; ^ user.cpp: In function ‘void read()’: user.cpp:57:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("produse.in", "r", stdin); ^ user.cpp:58:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &d); ^ user.cpp:62:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^ user.cpp: In function ‘void write()’: user.cpp:101:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("produse.out", "w", stdout); ^