Compilare: main.cpp: In function 'int main()': main.cpp:60:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int pos=0;pos<events.size();){ ~~~^~~~~~~~~~~~~~ main.cpp:62:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < events.size() && events[pos].val == it){ ~~~~^~~~~~~~~~~~~~~ main.cpp:72:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos < events.size()) ~~~~^~~~~~~~~~~~~~~