Compilare: user.cpp: In function ‘int main()’: user.cpp:66:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.in", "r", stdin); ^ user.cpp:67:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.out", "w", stdout); ^ user.cpp: In function ‘int bsearch0(int)’: user.cpp:23:11: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (v[mid] == x) { ^ user.cpp: In function ‘int bsearch1(int)’: user.cpp:46:9: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] return mid; ^ user.cpp: In function ‘int bsearch2(int)’: user.cpp:62:9: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] return mid; ^ user.cpp: In function ‘int main()’: user.cpp:85:26: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << bsearch2(x) + 2 << '\n'; ^ user.cpp:83:22: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << bsearch1(x) << '\n'; ^