Compilare: main.cpp: In function 'int main()': main.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < e.size(); ++i){ ~~^~~~~~~~~~ main.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j+1 < e.size() && e[j+1].ff < e[i].ss){ ~~~~^~~~~~~~~~