Compilare: user.cpp: In function ‘int main()’: user.cpp:50:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(c!=next) ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tdeque.in","r",stdin); ^