Compilare: user.cpp: In function ‘int main()’: user.cpp:37:25: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int n, k, q, x, y, z, a; ^ user.cpp: In function ‘int kthelem(int, int, int)’: user.cpp:34:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:40:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d%d%d", &n, &k, &q, &x, &y, &z); ^