Compilare: user.cpp: In function ‘void update(int, int, std::vector<int>&)’: user.cpp:21:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; i < aib.size(); i = next(i)) ^ user.cpp: In function ‘int search(int, const std::vector<int>&)’: user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (li < aib.size() && prefixSum(li, aib) == sum) ? li : -1; ^ user.cpp: In function ‘int main()’: user.cpp:54:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ user.cpp:59:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x); ^ user.cpp:65:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &op); ^ user.cpp:68:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &a, &b); ^ user.cpp:74:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &a, &b); ^ user.cpp:80:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a); ^