Compilare: main.cpp: In function 'int main()': main.cpp:34:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); ++i) ~^~~~~~~~~ main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i; j<v.size(); ++j) ~^~~~~~~~~ main.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); ++i) ~^~~~~~~~~ main.cpp:59:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i; j<v.size(); ++j) ~^~~~~~~~~