Compilare: main.cpp: In function 'int main()': main.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pct.size()-1;i++) ~^~~~~~~~~~~~~ main.cpp:70:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<nrPct.size();it++) ~~^~~~~~~~~~~~~