Compilare: user.cpp: In function ‘int query(int)’: user.cpp:69:17: warning: unused variable ‘p’ [-Wunused-variable] int i = l0, p = 1 << 17, j = 0; ^ user.cpp: In function ‘void read()’: user.cpp:44:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dsip.in", "r", stdin); ^ user.cpp:46:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:49:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &v[i].x, &v[i].y); ^ user.cpp:52:73: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &V[i].a.x, &V[i].a.y, &V[i].b.x, &V[i].b.y); ^ user.cpp: In function ‘void write()’: user.cpp:134:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dsip.out", "w", stdout); ^