Compilare: user.cpp: In function ‘int main()’: user.cpp:43:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++i) { ^ user.cpp:44:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i != v.size() - 1 && (v[i].x + v[i + 1].x) < ans) break; ^ user.cpp:45:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j < v.size() && v[j].x + v[i].x > ans; ++j) { ^