Compilare: main.cpp: In function 'int main()': main.cpp:78:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vec[i].size();++j) ~^~~~~~~~~~~~~~ main.cpp:89:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vec[i].size();++j) ~^~~~~~~~~~~~~~ main.cpp:108:17: warning: unused variable 'catre' [-Wunused-variable] int catre=drum[k-l].second; ^~~~~