Compilare: main.cpp: In function 'void rmq::construct()': main.cpp:25:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i=0; i<ref.size(); i++) { | ~^~~~~~~~~~~ main.cpp:31:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i=0; i+(1<<step)<=ref.size(); i++) { | ~~~~~~~~~~~^~~~~~~~~~~~ main.cpp:32:63: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 32 | rmq[step][i]=max(rmq[step-1][i],rmq[step-1][i+(1<<step-1)]); | ~~~~^~ main.cpp:36:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int i=2; i<=ref.size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'void rmq::init()': main.cpp:48:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int i=0; i<ref.size(); i++) { | ~^~~~~~~~~~~