Compilare: main.cpp: In function 'int main()': main.cpp:52:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v1.size();j++) ~^~~~~~~~~~ main.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v1.size();j++) ~^~~~~~~~~~ main.cpp:70:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v1.size();j++) ~^~~~~~~~~~