Compilare: main.cpp: In function 'int main()': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (in = 0; in < stari.size(); in++) { ~~~^~~~~~~~~~~~~~ main.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (st = 0; st < stari.size(); st++) { ~~~^~~~~~~~~~~~~~ main.cpp:46:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (st = 0; st < stari.size(); st++) { ~~~^~~~~~~~~~~~~~