Compilare: main.cpp: In function 'void init(std::vector<std::vector<int> >&, const std::vector<int>&)': main.cpp:16:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i = 1; (1 << i) <= v.size(); i++) { | ~~~~~~~~~^~~~~~~~~~~ main.cpp:18:49: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int j = 0; j + (1 << i) - 1 < v.size(); j++) { | ~~~~~~~~~~~~~~~~~^~~~~~~~~~