Compilare: main.cpp: In function 'int main()': main.cpp:50:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + 1 < a.size(); i ++) ~~~~~~^~~~~~~~~~ main.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = b.size(); i < aux.size(); i ++) ~~^~~~~~~~~~~~ main.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size(); i ++) ~~^~~~~~~~~~