Compilare: user.cpp: In function ‘int main()’: user.cpp:68:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stiv[k-1]<((int)nract-48) && (k)+n-i-1>=m){ //stiva.top()<nr[i] && stiva.size()+n-i-1>=m ^ user.cpp:70:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(stiv[k-1]<((int)nract-48) && k+n-i-1>=m && k>0){ //stiva.top()<nr[i] && stiva.size()+n-i-1>=m ^