Compilare: user.cpp: In function ‘void cautbin(int)’: user.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (b[mid]<x) ^ user.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (b[mid]>x) ^ user.cpp:26:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (b[mid]==x) ^ user.cpp: In function ‘int main()’: user.cpp:36:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("crescator1.in", "r", stdin); ^ user.cpp:37:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("crescator1.out", "w", stdout); ^ user.cpp:38:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:40:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^