Compilare: main.cpp: In function 'int main()': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<t.size(); i++) ~^~~~~~~~~ main.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<t.size(); i++) ~^~~~~~~~~ main.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<t.size(); i++) { ~^~~~~~~~~