Compilare: user.cpp: In function ‘int push(std::pair<long long int, int>)’: user.cpp:72:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int pop()’: user.cpp:110:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void citeste(int&)’: user.cpp:118:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz==nmax) fread(buff,1,nmax,stdin),poz=0; ^ user.cpp:123:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz==nmax) fread(buff,1,nmax,stdin),poz=0; ^ user.cpp: In function ‘int main()’: user.cpp:244:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("nolife.in","r",stdin); ^