Compilare: user.cpp: In function ‘void read()’: user.cpp:81:17: warning: unused variable ‘a’ [-Wunused-variable] int a, b, c; ^ user.cpp:81:20: warning: unused variable ‘b’ [-Wunused-variable] int a, b, c; ^ user.cpp:81:23: warning: unused variable ‘c’ [-Wunused-variable] int a, b, c; ^ user.cpp:68:12: warning: unused variable ‘ty’ [-Wunused-variable] int i, ty; ^ user.cpp:69:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuiburi.in", "r", stdin); ^ user.cpp:70:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:73:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i].ty); ^ user.cpp:76:77: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &v[i].lx, &v[i].ly, &v[i].rx, &v[i].ry); ^ user.cpp:82:60: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &v[i].lx, &v[i].ly, &v[i].rx); ^ user.cpp: In function ‘void write()’: user.cpp:105:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuiburi.out", "w", stdout); ^