Compilare: main.cpp: In function 'void add(int, int)': main.cpp:31:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = x;i<p.size();i+=(i&-i))p[i]+=val; | ~^~~~~~~~~ main.cpp: In function 'long long int prefsum(int)': main.cpp:39:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 39 | for(int i = x;i>0;i--)res+=p[i];return res; | ^~~ main.cpp:39:37: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 39 | for(int i = x;i>0;i--)res+=p[i];return res; | ^~~~~~