Compilare: user.cpp: In function ‘int query(int, int, int, int, int, int)’: user.cpp:42:26: warning: variable ‘i1’ set but not used [-Wunused-but-set-variable] int m = (l + r) / 2, i1 = 0, i2 = 0; ^ user.cpp:42:34: warning: variable ‘i2’ set but not used [-Wunused-but-set-variable] int m = (l + r) / 2, i1 = 0, i2 = 0; ^ user.cpp: In function ‘int main()’: user.cpp:134:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("castori.in", "r", stdin); ^ user.cpp:135:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("castori.out", "w", stdout); ^ user.cpp:136:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &K); ^ user.cpp:138:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &cx, &cy); ^