Compilare: main.cpp: In function 'int main()': main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<pf[v-1].size() and p.first>=pf[v-1][ind].first) ~~~^~~~~~~~~~~~~~~ main.cpp:65:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind==pf[v-1].size()) ~~~^~~~~~~~~~~~~~~~