Compilare: user.cpp: In function ‘int main()’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pnt[r].first < rest[r].size() && rest[r][pnt[r].first] < i - a + 1) { ^ user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pnt[r].second < rest[r].size() && rest[r][pnt[r].second] > i - b + 1) { ^