Compilare: main.cpp: In function 'void rmq::construct()': main.cpp:28:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(int i=0; i<ref.size(); i++) { | ~^~~~~~~~~~~ main.cpp:34:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i=0; i+(1<<step)<=ref.size(); i++) { | ~~~~~~~~~~~^~~~~~~~~~~~ main.cpp:35:63: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 35 | rmq[step][i]=max(rmq[step-1][i],rmq[step-1][i+(1<<step-1)]); | ~~~~^~ main.cpp: In function 'void rmq::init()': main.cpp:51:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i=0; i<ref.size(); i++) { | ~^~~~~~~~~~~ main.cpp: At global scope: main.cpp:85:13: warning: 'bool cmp(int, int)' defined but not used [-Wunused-function] 85 | static bool cmp(int x, int y) { | ^~~