Compilare: main.cpp: In function 'int main()': main.cpp:105:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | while(l < xx.size() && xx[l].first <=q[i].k){ | ~~^~~~~~~~~~~ main.cpp:111:13: warning: unused variable 'l1' [-Wunused-variable] 111 | int l1 = st[q[i].x]; | ^~ main.cpp:112:13: warning: unused variable 'l2' [-Wunused-variable] 112 | int l2 = st[q[i].y]; | ^~