Compilare: user.cpp: In function ‘int main()’: user.cpp:129:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(freq[j]) if(ultim==-1) ultim=j; ^ user.cpp:94:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ user.cpp:95:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^