Compilare: user.cpp: In function ‘int query(coord)’: user.cpp:54:29: warning: unused variable ‘j’ [-Wunused-variable] int i = 0, p = 1 << 22, j = 0; ^ user.cpp: In function ‘int Query(coord)’: user.cpp:65:29: warning: unused variable ‘j’ [-Wunused-variable] int i = 0, p = 1 << 22, j = 0; ^ user.cpp: In function ‘void read()’: user.cpp:78:35: 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:80:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:83:41: 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:92:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &p.a.x, &p.a.y, &p.b.x, &p.b.y); ^ user.cpp: In function ‘void write()’: user.cpp:175:37: 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); ^