Compilare: main.cpp: In function 'int main()': main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<pos.size(); j++){ ~^~~~~~~~~~~ main.cpp:28:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (p=j+1; p<pos.size(); p++) ~^~~~~~~~~~~ main.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<a.size(); j++){ ~^~~~~~~~~ main.cpp:44:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (p=0; p<r.size(); p++) ~^~~~~~~~~