Compilare: main.cpp: In function 'int main()': main.cpp:12:7: warning: unused variable 'r' [-Wunused-variable] int n,r=0,h; ^ main.cpp:14:19: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%d",&n); ^ main.cpp:16:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%d",&v[i]); ^ main.cpp:27:5: warning: 'h' may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i]==h){ ^~