Compilare: main.cpp: In member function 'void Fenwick::build(std::vector<long long int>&)': main.cpp:111:37: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 111 | if(i+jump(i)<fw.size()) fw[i+jump(i)] += fw[i]; | ~~~~~~~~~^~~~~~~~~~ main.cpp: In member function 'void Fenwick::update(long long int, long long int)': main.cpp:117:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 117 | for(;pos<fw.size();pos+=jump(pos)) fw[pos] += val; | ~~~^~~~~~~~~~