Compilare: user.cpp: In function ‘void update(std::vector<int>&, int, const int&)’: user.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; pos < aib.size(); pos+= lsb(pos)) ^ user.cpp: In function ‘void build(int, int, int)’: user.cpp:49:14: warning: unused variable ‘p’ [-Wunused-variable] for (int p = 0, i = st; i <= dr; ++i) if (pb[a[i]]) ^ user.cpp: In function ‘void update(int, int, int)’: user.cpp:65:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos + msk < pom[nod].vals.size() && pom[nod].vals[pos + msk] <= qy) ^ user.cpp: In function ‘int query(int, int, int)’: user.cpp:82:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos + msk < pom[nod].vals.size() && pom[nod].vals[pos + msk] <= qy) ^ user.cpp: In function ‘int main()’: user.cpp:104:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sccm.in", "r", stdin); ^ user.cpp:105:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sccm.out", "w", stdout); ^ user.cpp: In function ‘char nextch()’: user.cpp:19:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 1 << 17, stdin); ^