Compilare: user.cpp: In function ‘void read()’: user.cpp:25:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void solve()’: user.cpp:61:45: warning: unused variable ‘hfgg’ [-Wunused-variable] int hfgg = 0; ^ user.cpp: In function ‘void read()’: user.cpp:26:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("studenti.in", "r", stdin); ^ user.cpp:27:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:31:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &v[i].w, &v[i].h); ^ user.cpp: In function ‘void write()’: user.cpp:89:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("studenti.out", "w", stdout); ^