Compilare: user.cpp: In function ‘int main()’: user.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < v.size() && (i+1) < v.size()) ^ user.cpp:50:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < v.size() && (i+1) < v.size()) ^ user.cpp:53:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < v.size() ) ^ user.cpp:56:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j < v.size() && (j+1) < v.size()) ^ user.cpp:56:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j < v.size() && (j+1) < v.size()) ^ user.cpp:59:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j < v.size()) ^ user.cpp:72:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < r.size(); ++i) ^