Compilare: user.cpp: In function ‘void cnt()’: user.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<ss.size() && j<m;) { ^ user.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=i; k<ss.size() && ss[k].find(j)==ss[k].end(); ++k); ^ user.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==ss.size()) { ^ user.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=i+1; k<ss.size(); ++k) if(ss[k].find(j)!=ss[k].end()) { ^ user.cpp: In function ‘int main()’: user.cpp:59:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<r[ii][jj].size(); ++k) aux.push_back(r[ii][jj][k]); ^ user.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<aux.size(); ++k) s.insert(aux[k]); ^