Compilare: user.cpp: In function ‘int query(int)’: user.cpp:23:13: warning: statement has no effect [-Wunused-value] for (pos; pos <= n; pos += pos & -pos) ^ user.cpp: In function ‘void update(int, int)’: user.cpp:30:13: warning: statement has no effect [-Wunused-value] for (pos; pos; pos -= pos & -pos) ^ user.cpp: In function ‘int main()’: user.cpp:36:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi.in", "r", stdin); ^ user.cpp:37:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi.out", "w", stdout); ^ user.cpp:39:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:41:65: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &x[i], &s[i].c, &s[i].st, &s[i].dr); ^