Compilare: user.cpp: In function ‘int binarySearch(std::vector<int>&, int)’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(best + (1<<step) < v.size() && v[best + (1<<step)] <= value) best += (1<<step); ~~~~~~~~~~~~~~~~~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:52:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("palind2.in", "r", stdin); ^ user.cpp:53:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("palind2.out", "w", stdout); ^ user.cpp:57:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:60:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:66:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 0; i < n; ++i) scanf("%d", &v[i]); ^