Compilare: user.cpp: In function ‘void Update(int, int, int, int, int, int, long long int)’: user.cpp:89:19: warning: unused variable ‘x’ [-Wunused-variable] long long x = Intersection(tree[node].first->d, tree[node].second->d); ^ user.cpp: In function ‘int main()’: user.cpp:173:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gard6.in", "r", stdin); ^ user.cpp:174:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gard6.out", "w", stdout); ^ user.cpp:176:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:178:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &height[i]); ^