Compilare: main.cpp: In function 'int main()': main.cpp:64:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size() - 1; ++i) ~~^~~~~~~~~~~~~~ main.cpp:65:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < v.size(); ++j) { ~~^~~~~~~~~~ main.cpp:71:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) ~~^~~~~~~~~~