Compilare: main.cpp: In function 'int main()': main.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < words.size() - 1;++i) ~~^~~~~~~~~~~~~~~~~~ main.cpp:70:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1;j < words.size();++j) ~~^~~~~~~~~~~~~~ main.cpp:75:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < words.size();++i) ~~^~~~~~~~~~~~~~ main.cpp:79:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < words.size();++i) ~~^~~~~~~~~~~~~~