Compilare: user.cpp: In function ‘void BS()’: user.cpp:77:25: warning: unused variable ‘x’ [-Wunused-variable] int i, p = 1 << 19, x = a[cell].val; ^ user.cpp: In function ‘void read()’: user.cpp:31:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice2.in", "r", stdin); ^ user.cpp:32:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &q); ^ user.cpp:36:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[++ nr].val); ^ user.cpp:43:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &v[i].xa, &v[i].ya, &v[i].xb, &v[i].yb); ^ user.cpp: In function ‘void write()’: user.cpp:104:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice2.out", "w", stdout); ^