Compilare: main.cpp: In function 'int main()': main.cpp:22:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:24:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&v[i]); ^ main.cpp:36:16: warning: 'pn' may be used uninitialized in this function [-Wmaybe-uninitialized] sol[++elem]=pn; ~~~~~~~~~~~^~~