Compilare: user.cpp: In function ‘void sterge(int)’: user.cpp:69:29: warning: operation on ‘s’ may be undefined [-Wsequence-point] dr[s]->n = dr[s--]->n->n; ^ user.cpp: At global scope: user.cpp:80:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(){ ^ user.cpp: In function ‘int main()’: user.cpp:96:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s1.size();j++){ ^ user.cpp:115:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s1.size();j++){ ^