Compilare: main.cpp: In function 'int main()': main.cpp:8:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &n); ^ main.cpp:12:34: 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:28:13: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] last=prev[last]; ~~~~^~~~~~~~~~~