Compilare: user.cpp: In function ‘int main()’: user.cpp:15:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.cpp:41:13: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] s+=k; ^