Compilare: user.cpp: In function ‘void calcpref()’: user.cpp:15:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<s[i].size();j++) ^ user.cpp: In function ‘void calcps()’: user.cpp:27:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<s[j].size();idx++) ^ user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==s[i].size()-1&&del[j]==0) {del[i]=1;} ^ user.cpp: In function ‘int main()’: user.cpp:88:14: warning: unused variable ‘cpy’ [-Wunused-variable] int cpy=rasp; ^