Compilare: main.cpp: In function 'void build(int, int, int)': main.cpp:48:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&val); ^ main.cpp: In function 'int main()': main.cpp:132:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&q); ^ main.cpp:138:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d",&t,&l,&r,&k); ^ main.cpp: In function 'void set_kth(int, int, int)': main.cpp:113:30: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] update_set(1,1,n,l,r,val); ^