Compilare: main.cpp: In function 'int main()': main.cpp:226:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int z = 0; z < dragoni.size(); z++) ~~^~~~~~~~~~~~~~~~ main.cpp:242:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (ix = 0; ix < vdist.size(); ix++) ~~~^~~~~~~~~~~~~~ main.cpp:256:17: warning: ignoring return value of 'int system(const char*)', declared with attribute warn_unused_result [-Wunused-result] system("pause"); ^