Compilare: main.cpp: In function 'int main()': main.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i){ ~^~~~~~~~~ main.cpp:52:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<v.size();++j){ ~^~~~~~~~~ main.cpp:68:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i){ ~^~~~~~~~~ main.cpp:76:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i) ~^~~~~~~~~