Compilare: main.cpp: In function 'int main()': main.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<elem.size()-1;i++) ~^~~~~~~~~~~~~~ main.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<elem.size();j++) ~^~~~~~~~~~~~ main.cpp:56:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<elem.size();i++) ~^~~~~~~~~~~~ main.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<elem.size();j++) ~^~~~~~~~~~~~ main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<elem.size();j++) ~^~~~~~~~~~~~