Compilare: main.cpp: In function 'void precalc()': main.cpp:47:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for (int i = 0; i < e.size(); i++) | ~~^~~~~~~~~~ main.cpp:49:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for (int j = 1; (1 << j) <= e.size(); j++) { | ~~~~~~~~~^~~~~~~~~~~ main.cpp:50:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (int i = 0; i + (1 << j) - 1 < e.size(); i++) { | ~~~~~~~~~~~~~~~~~^~~~~~~~~~