Compilare: user.cpp: In function ‘int main()’: user.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int o = 0; o < nr.size(); o++) { ^ user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size() - 1; i++) ^ user.cpp:37:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < x.size(); j++) ^ user.cpp:47:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < dif.size(); j++) { ^ user.cpp:58:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (maxDif[k] == 0&&k<x.size()) ^ user.cpp:60:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k >= x.size()) ^ user.cpp:63:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = k; i < x.size(); i++) ^ user.cpp:68:17: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result] system("pause"); ^