Compilare: user.cpp: In function ‘int main()’: user.cpp:22:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrtri.in", "r",stdin); ^ user.cpp:23:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrtri.out","w",stdout); ^ user.cpp:24:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:26:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^ user.cpp: In function ‘int search(int, int, int)’: user.cpp:8:6: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mid; ^ user.cpp: In function ‘int main()’: user.cpp:8:6: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized]