Compilare: user.cpp: In function ‘void printMat(std::vector<std::vector<int> >)’: user.cpp:91:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v.size(); i++) { ^ user.cpp:92:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<v[i].size(); j++) { ^ user.cpp: In function ‘void setList(std::vector<int>&)’: user.cpp:99:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<tip.size(); i++) { ^ user.cpp:100:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<tip[i].size(); j++) { ^ user.cpp: In function ‘int main()’: user.cpp:140:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<mult.size(); i++) { ^ user.cpp:142:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<mult[i].size(); j++) { ^ user.cpp: In function ‘bool cond(int, int, int)’: user.cpp:13:1: warning: control reaches end of non-void function [-Wreturn-type] } ^